阅读说明：本技术 用于时隙聚合的资源分配信令 (Resource allocation signaling for timeslot aggregation ) 是由 R.鲍尔德梅尔 D.陈拉尔松 F.奧弗舍 于 2017-03-24 设计创作，主要内容包括：公开了一种在无线电接入网中操作网络节点(100)的方法。该方法包括传送下行链路控制信息消息,该下行链路控制信息消息包括时隙分配指示和符号分配指示。时隙分配指示,指示包括被分配用于与至少一个用户设备(10)通信的多个时隙的时隙聚合,其中每个时隙包括多个符号。符号分配指示,指示根据用于多个时隙中的两个或更多个的分配模式将符号分配给至少一个信道。本公开还涉及相关的方法和装置。(A method of operating a network node (100) in a radio access network is disclosed. The method includes transmitting a downlink control information message including a slot allocation indication and a symbol allocation indication. A slot allocation indication comprising a slot aggregation of a plurality of slots allocated for communication with at least one user equipment (10), wherein each slot comprises a plurality of symbols. A symbol allocation indication indicating allocation of symbols to at least one channel according to an allocation pattern for two or more of the plurality of slots. The disclosure also relates to related methods and devices.)

1. A method of operating a network node (100) in a radio access network, the method comprising transmitting a downlink control information message comprising a slot allocation indication and a symbol allocation indication;

the slot allocation indication indicating a slot aggregation comprising a plurality of slots allocated for communication with at least one user equipment (10), wherein each slot comprises a plurality of symbols;

and the symbol allocation indication indicating allocation of symbols to at least one channel according to an allocation pattern for two or more of the plurality of slots.

2. Network node (100) for a radio access network, the network node (100) being adapted to transmit a downlink control information message comprising a slot allocation indication and a symbol allocation indication;

the slot allocation indication indicating a slot aggregation comprising a plurality of slots allocated for communication with at least one user equipment (10), wherein each slot comprises a plurality of symbols;

and the symbol allocation indication indicating allocation of symbols to at least one channel according to an allocation pattern for two or more of the plurality of slots.

3. A method of operating a user equipment in a radio access network, the method comprising communicating with slot aggregation based on a received downlink control information message, the downlink control information message comprising a slot allocation indication and a symbol allocation indication,

the slot allocation indication indicating a slot aggregation comprising a plurality of slots allocated for communication with the user equipment (10), wherein each slot comprises a plurality of symbols;

and the symbol allocation indication indicating allocation of symbols to at least one channel according to an allocation pattern for two or more of the plurality of slots.

4. User equipment (10) for a radio access network, the user equipment (10) being adapted to communicate with slot aggregation based on received downlink control information messages, the downlink control information messages comprising a slot allocation indication and a symbol allocation indication,

the slot allocation indication indicating a slot aggregation comprising a plurality of slots allocated for communication with the user equipment (10), wherein each slot comprises a plurality of symbols;

and the symbol allocation indication indicating allocation of symbols to at least one channel according to an allocation pattern for two or more of the plurality of slots.

5. Method or apparatus according to one of the preceding claims, wherein the slot allocation indication comprises a bit pattern indicating the number of slots being aggregated and/or a slot position indication indicating the position of the reference slot of the slot aggregation.

6. Method or apparatus according to one of the preceding claims, wherein the symbol allocation indication comprises a bit pattern indicating the allocation pattern and/or the channel or channels to which the symbol is allocated.

7. Method or apparatus according to one of the preceding claims, wherein the allocation pattern indicates a starting symbol and/or an ending symbol and/or a number of symbols allocated to a specific channel.

8. Method or apparatus according to one of the preceding claims, wherein the allocation pattern indicates a guard period between symbols of the pattern allocated to a downlink channel and symbols of the pattern allocated to an uplink channel.

9. Method or apparatus according to one of the preceding claims, wherein the downlink control information message comprises one or more deviation indications indicating a deviation from the pattern for one or more time slots.

10. Program product comprising instructions for causing a processing circuit to control and/or carry out a method according to one of claims 1, 3, 5 to 9.

11. Carrier medium arranged to carry and/or store a program product according to claim 10.

Technical Field

The present disclosure relates to wireless communication technology, in particular in the context of 5G telecommunications (e.g., new air interface (NR) or LTE evolution).

Background

Following the aggregation of multiple carriers or the aggregation of carriers combined together in the frequency domain, the current development of wireless communication technology also goes into the direction of aggregating transmission timing structures in the time domain.

Disclosure of Invention

The object of the present disclosure is to provide the following method: the method allows efficient signaling, in particular overhead limited signaling, in the context of slot (slot) aggregation as a form of transmission timing structure aggregation.

The methods described herein are particularly useful in the context of NR radio access technologies/networks (NR RAT/RAN). Thus, in particular, the network node may be a gNB (or eNB in some cases).

Accordingly, a method of operating a network node in a radio access network is disclosed. The method includes transmitting a downlink control information message including a slot allocation indication and a symbol allocation indication. A slot allocation indication comprising a slot aggregation of a plurality of slots allocated for communication with at least one user equipment, wherein each slot comprises a plurality of symbols. A symbol allocation indication indicating allocation of symbols to at least one channel according to an allocation pattern (pattern) for two or more of the plurality of slots.

A network node for a radio access network is also disclosed. The network node is adapted to transmit a downlink control information message comprising a slot allocation indication and a symbol allocation indication. A slot allocation indication comprising a slot aggregation of a plurality of slots allocated for communication with at least one user equipment, wherein each slot comprises a plurality of symbols. A symbol allocation indication indicating allocation of symbols to at least one channel according to an allocation pattern for two or more of the plurality of slots. The network node may comprise and/or be adapted to utilize processing circuitry and/or radio circuitry, in particular a transmitter, for such transmission. Alternatively or additionally, the network node may comprise a corresponding transmitting module.

A method of operating a user equipment, UE, in a radio access network may be considered. The method includes communicating with slot aggregation based on a received downlink control information message, the downlink control information message including a slot allocation indication and a symbol allocation indication. The slot allocation indication indicates a slot aggregation comprising a plurality of slots allocated for communication with the user equipment, wherein each slot comprises a plurality of symbols. A symbol allocation indication indicating allocation of symbols to at least one channel according to an allocation pattern for two or more of the plurality of slots.

Furthermore, a user equipment for a radio access network is described. The user equipment is adapted to communicate using slot aggregation based on a received downlink control information message comprising a slot allocation indication and a symbol allocation indication. The slot allocation indication indicates a slot aggregation comprising a plurality of slots allocated for communication with the user equipment, wherein each slot comprises a plurality of symbols. A symbol allocation indication indicating allocation of symbols to at least one channel according to an allocation pattern for two or more of the plurality of slots. The UE may comprise and/or be adapted to utilize processing circuitry and/or radio circuitry, in particular a transmitter and/or a receiver, for such communication. Alternatively or additionally, the UE may comprise a corresponding communication module.

The slot allocation indication may comprise a bit pattern indicating the number of slots being aggregated and/or a slot position indication indicating the position of a reference slot of the slot aggregation. For example, there may be a unique or 1-1 mapping of slot aggregation length (number of slots in the aggregation) and/or reference slot position to bit pattern according to a table that may be predefined or configured.

The slot positions may generally relate to placement in the time domain and/or to timing or timing structure. The slot position may indicate where the slot is located in time, for example by providing an absolute slot number or a slot number relative to another slot, e.g., a slot in which the downlink control information is received. The reference slot may be a slot of a slot aggregation, and the location of the slot aggregation may be determined or fixed based on its location. The reference slot may in particular be the first slot of a slot aggregation or the last slot of a slot aggregation. Based on the number of slots in the slot aggregation and the reference slot, the time interval covered by the slot aggregation may be defined or determined.

The bit pattern may generally comprise one or more bits, in particular 2, 3 or 4 bits. It can be generally considered that the symbol allocation indication comprises 3 bits, which can be mapped to an allocation pattern, e.g. represented by a start symbol and/or an end symbol and/or a length. The slot allocation indication may include 3 bits, which may be mapped to a reference slot location and/or the number of slots in the aggregation.

The symbol allocation indication may comprise a bit pattern indicating the allocation pattern and/or the channel or channels to which the symbols are allocated.

The (allocation) pattern may indicate or represent a starting symbol and/or an ending symbol and/or a number of symbols allocated to a particular channel.

In some variations, the allocation pattern may indicate or include a guard period between symbols of the allocation pattern allocated to the downlink channel and symbols of the pattern allocated to the uplink channel, and/or vice versa. The guard period may include and/or extend beyond one or more symbol time lengths. The guard period may be associated with no transmission or reception being scheduled.

The downlink control information message may include one or more deviation indications, which typically indicate a deviation from said pattern for one or more time slots. Alternatively or additionally, the downlink control information message may indicate a frequency resource allocation, e.g. a subcarrier range, for one or more time slots, in particular for all time slots, for time slot aggregation. The frequency resource allocation may be indicated by a frequency allocation indication and/or may be the same for more than one time slot of the aggregation of time slots, in particular for all time slots. In the latter case, only one indication may be needed and/or provided. Further, alternatively or additionally, the downlink control information message may include a frequency hopping indication, which may indicate a frequency hopping scheme for channels allocated, for example, between different time slots of the time slot aggregation and/or within individual time slots.

Alternatively or additionally, it may be considered that the method by which the network node is adapted and/or operated comprises: a second message, such as a downlink control information message and/or other configuration message (including configuration data) is transmitted, the second message including one or more deviation indications. The communication using slot aggregation may also be based on the second message. Thus, greater flexibility for deviations from the mode may be provided while limiting the overhead of downlink control information messages. The second message and/or the downlink control message may be valid for the duration of the slot aggregation (dynamic), or for a plurality of such durations (semi-static), e.g. provided in RRC signaling.

Allocating the aggregation of timeslots for communication may involve allocating resources associated with the aggregated timeslots for communication. The resources may be time-frequency resources associated with and/or arranged or located within time intervals defined by the slot aggregation, the time intervals being respectively associated with symbol time intervals of symbols of the slot aggregation, the symbols comprising symbols of the aggregated slot. The allocation may generally include, for example, indicating to the user equipment which symbols and/or resources to use for which communication (e.g., transmission or reception), and/or on which channel.

The allocation pattern may generally indicate at least one channel allocated to one or more symbols (or vice versa, as the allocation may represent a unique or 1-1 mapping). However, in some cases, more than one channel may be allocated to a symbol, e.g., control and data channels. In this case, the channels may be multiplexed, in particular in frequency. Such channels may represent communication in the same direction, e.g., transmission or reception. For example, the allocation pattern may indicate one or more frequency resources allocated to one or more channels, or may be implicitly indicated as such, depending on configuration or predefined or regular. The allocation pattern may allocate symbols for two or more slots such that the pattern of symbols repeats for each slot. For example, one or more identical channels may be allocated to symbols (respectively associated resources) having the same number within each slot. It may be assumed that the symbols in a slot may be numbered with consecutive integers, e.g. from 0 to 6 or from 0 to 13, or from 1 to 7 or from 1 to 14, depending on the total number of symbols in the slot. The numbering may be similar between slots having the same number of symbols. Consecutively numbered symbols may be adjacent to each other in the time domain, with a common time boundary.

The downlink control information message may allocate and/or schedule the time slot aggregation such that the time slot aggregated resources are allocated for communication.

A slot may comprise a plurality of symbols, in particular 7 or 14 symbols. However, in some variations, a slot may be implemented as a mini-slot having fewer symbols than a full slot. It can be considered that the slots of the slot aggregation have the same number of symbols and/or that the slots of the slot aggregation have the same duration (spread in the time domain). However, variations of aggregating slots of different slot durations or with different numbers of symbols into a slot aggregation may be considered. In this context, it can be considered that the allocation pattern only involves a limited signaling overhead with slots of the same duration or the same number of symbols. The slot aggregation may comprise two or more slots, in particular 2, 3 or 4, or an even number of slots.

Assigning the symbols to at least one channel may include indicating one or more channels over which to communicate. The channel may be an uplink or downlink or sidelink channel. In particular, the channel may be a physical channel. Examples of channels that may be allocated include PUCCH, PUSCH, PDSCH, PDCCH. The channel may be a control channel, such as PUCCH or PDCCH, or a data channel, such as PUSCH or PDSCH. The control channel, in particular the downlink control channel, may be arranged or allocated in a control region, e.g. at the beginning of a slot, which may cover one or more symbols of the slot aggregation. It can be considered that the uplink control region is allocated with an uplink control channel. The allocation pattern may be continuous, for example in the time and/or frequency domain, for a time interval covering one or more symbols and/or a frequency interval covering one or more subcarriers. Such a pattern may appear as a rectangle in the time/frequency graphical representation. The symbol allocation indication may indicate the position and/or extension of such a pattern in the time domain, e.g. by indicating a start symbol and an end symbol and/or a start symbol or an end (also called stop) symbol and a duration or length (e.g. over the number of symbols). Specifically, for example, the symbol may be an OFDM (orthogonal frequency division multiplexing) symbol in the NR downlink, or an OFDMA (orthogonal frequency division multiple access) or SC-FDMA (single carrier frequency division multiple access) symbol in the uplink or sidelink.

Communicating using timeslot aggregation may include transmitting and/or receiving on a channel allocated according to an allocation pattern.

The time slots of the slot aggregation may be arranged in time such that they form a continuous time interval covered by the symbol time interval of the slot symbol.

In general, a symbol may be associated with a symbol time interval and a frequency range (e.g., a number of subcarriers). For ease of reference, even if only the time domain extension (symbol time interval) is mentioned, it may be referred to as a symbol. In the context of resources or allocations, symbol spreading to the frequency domain may be assumed. The symbols or slots of the slot aggregation may comprise the same extension in the frequency domain, e.g. relating to the same subcarriers or carriers. The spreading in the frequency domain may be continuous.

The allocation pattern for a plurality of slots may be considered to comprise an allocation (sub-) pattern valid for one slot, which pattern repeats in other slots of the plurality of slots.

It should be noted that in some variants, the slot allocation indication and the symbol allocation indication relate to allocations in the time domain, to symbols or slots, respectively, their associated time intervals. The frequency allocation may be indicated implicitly or explicitly with a corresponding frequency allocation indication in a downlink control information message.

The downlink control information message may include downlink control information, particularly downlink control information related to scheduling and/or allocation for uplink and/or downlink and/or sidelink communications.

Also disclosed is a program product comprising instructions for causing a processing circuit to control and/or perform any of the methods described herein.

Furthermore, a carrier medium arrangement is disclosed, carrying and/or storing a program product as disclosed herein.

The transmission timing structure may generally comprise a plurality of symbols or symbol time intervals (e.g., predefined and/or configured). A slot may be considered a representation or implementation of a transmission timing structure, and these terms may be interchanged within the context of this disclosure. The transmission timing structure may define a time interval. For a transmission timing structure and/or a slot, there may be associated frequency resources such that a slot may represent time/frequency resources based on the time interval of the slot. The time slot aggregation may include a plurality of time slots scheduled with a single downlink control information message.

Drawings

The drawings are provided to illustrate the concepts and methods described herein and are not intended to limit their scope. The drawings comprise:

figures 1 to 4 show exemplary variants of time slots for TDD;

figures 5 to 10 show examples of time slot aggregation;

fig. 11 shows an example of DL slot aggregation with allocation patterns;

fig. 12 shows an example of UL slot aggregation with allocation patterns;

FIG. 13 shows an example of slot aggregation with holes;

FIG. 14 shows an example of slot aggregation with indication of deviation;

FIG. 15 illustrates an exemplary user device;

FIG. 16 illustrates an exemplary network node;

FIG. 17 shows an exemplary diagram of a method of operating a user device;

FIG. 18 illustrates an exemplary user device;

fig. 19 shows an exemplary diagram of a method of operating a network node; and

fig. 20 illustrates an exemplary network node.

Detailed Description

NR supports a very flexible framework structure. The length of the slot can be 7 or 14 OFDM symbols. In TDD, a slot interval can contain only DL (downlink), only UL (uplink), or both UL and DL transmissions. Fig. 1 graphically illustrates DL-only slots, fig. 2 illustrates UL-only slots, fig. 3 illustrates heavy DL slots with UL at the end, and fig. 4 illustrates heavy UL slots with DL at the beginning. Fig. 1 to 4 show four types of time slots for TDD. In these examples, the slot length is N _ slot = 14. It should be noted that the concepts and methods described herein are only illustrated in the context of TDD, but are equally applicable to Frequency Division Duplexing (FDD). Furthermore, the slot duration may vary depending on the frequency or parameter set used, as the subcarrier spacing may depend on either, such that the symbol time interval associated with a symbol may be different for different carrier frequencies and/or parameter sets. Thus, the slot duration may vary for an equal number of symbols in the slot. It can be considered that the time slots described herein relate to the same set of parameters and/or subcarrier spacing and/or carriers, such that the symbols can have the same symbol time interval (symbol duration).

The DL portion of the slot often begins with a DL control region. The presence of the DL control region and the length of the DL control region may be dynamically indicated (e.g., via DCI on PDCCH), semi-statically configured (e.g., via RRC signaling), or blind detected by the UE.

The DL data region (PDSCH) in a slot can extend from the beginning of the slot to the end of the slot (DL-only slot) or stop earlier to accommodate UL opportunities in the end. The start of the PDSCH can be the beginning of a time slot or it can start within or after the control region. In case the PDSCH starts within the control region, special attention needs to be paid to how data and control channels (PDCCH) are multiplexed in the control channel region. If there is a UL opportunity at the end of the slot interval, the PDSCH must stop earlier to accommodate UL transmissions with DL- > UL and possibly also UL- > DL guard times or periods, e.g., when switching back to DL in the next slot.

Similar to the time slots of the heavy DL are the time slots of the heavy UL, but for this case the DL region (also referred to as DL for simplicity) is very short (e.g. 1 or 2 symbols), followed by the guard time and the UL region (also referred to as UL). The DL region may include one or more symbols in which downlink transmission (or reception thereof from the perspective of the UE) is scheduled, and the UL region may include one or more symbols in which uplink transmission is scheduled. Similarly, side link regions, such as side link transmission regions and/or side link reception regions, may be considered.

The UL contains a UL data region (PUSCH) at the beginning and, optionally, a UL control region (PUCCH) at the end. The PUSCH may stop before the UL control region, or it may continue until the end of the slot interval. Given that PUSCH continues until the end of a slot and overlaps with a symbol containing PUCCH, special attention needs to be paid to how data and control channels (PUCCH) are multiplexed in the control channel region.

Timeslot aggregation is discussed below.

To enable longer transmissions (to improve coverage) or to use fewer PDCCH transmissions (to reduce control channel overhead), it is possible to schedule transmission units consisting of several slots. Such a unit is called slot aggregation. One possibility would be to schedule the PDSCH/PUSCH of each slot with its own PDCCH, however, in this case the distinction of scheduling multiple slots separately becomes unclear. Therefore, it is assumed that slot aggregation is scheduled with a single DCI (single message). DCI downlink control information may be considered to represent more generalized downlink control information in the context of NR.

Fig. 5 to 7 show examples of different DL slot aggregations. As can be seen, the symbols available for PDSCH, as well as the symbol pattern, depend to a large extent on the slot aggregation format. These examples show that the PDSCH does not overlap with the DL control region, however, it is also possible that the PDSCH overlaps with the DL control region (partially or fully overlapping in time). Specifically, fig. 5 to 7 show examples of slot aggregation. In these examples, the slot length is N _ slot = 14. In fig. 5, a DL slot is followed by a DL slot without a DL control region. In fig. 6, both aggregated slots have DL control regions. In fig. 7, a DL slot with a control region is followed by a hybrid slot with both a DL control region and a UL opportunity.

In fig. 8 to 10, examples for UL slot aggregation are shown. As can be seen, the symbols available for PUSCH and the symbol pattern depend to a large extent on the slot aggregation format. Fig. 8 to 10 particularly show examples of UL slot aggregation. In these examples, the slot length is N _ slot = 14. In fig. 8, the UL-only slot is followed by a slot with emphasis on UL. In fig. 9, both slots are UL-heavy. In fig. 10, both slots are UL-heavy and have a UL control region at the end.

As can be seen from fig. 5 to 7 and fig. 8 to 10, a wide variety of slot aggregation formats can be considered. The symbols available for PDSCH/PUSCH depend to a large extent on the slot aggregation format. Since the slot aggregation is signaled in a single DCI message, the resource allocation for the full slot aggregation is contained in a single DCI message, particularly in the time domain, which involves allocating symbols to the channels. Given the large number of possibilities (only a few of which are shown in fig. 5-10), the signaling of the time domain resource allocation for PDSCH/PUSCH can become very complex and require large signaling overhead.

Methods of reducing overhead for time domain resource allocation signaling in time slot aggregation are discussed. The proposed signaling allows to define in detail the time domain allocation of PDSCH/PUSCH in a single slot based on a symbol allocation indication (hereinafter referred to as symbol allocation). At least one of a flexible start position, length and flexible stop position may be provided. For slot aggregation, symbol allocation is applied to a plurality of slots. Furthermore, the number of scheduled time slots may also be signaled using a time slot allocation indication (hereinafter referred to as time slot allocation).

The signalling required for slot aggregation is only slightly larger than that required for a single slot (the number of slots needed to provide the scheduling), however this would require only very few bits.

An optional extension of these methods allows for adjustments (offsets) to be made to the repeated resource allocations, e.g., there may be an additional single bit or very few additional bits assigned to each (or at least some) of the scheduled time slots to signal some adjustment, e.g., in the form of an offset indication.

The proposed solution reduces the signaling overhead for time domain resource allocation in time slot aggregation. This reduces the DCI size, which reduces the control channel load, which is often a bottleneck in wireless systems. With reduced control channel overhead, it is more often possible to schedule terminals, avoiding situations where data resources are available but cannot be scheduled due to lack of control resources. In addition, reduced DCI size also results in better control signaling coverage and/or improved control signaling detection rates.

The time domain resource allocation field of a DCI message for slot aggregation may comprise two parts (e.g., two fields or a joint field from which two information can be derived, and/or two bit patterns, or one bit pattern that is combined by two bit patterns into a larger bit pattern) representing a symbol allocation indication and a slot allocation indication. The number of scheduled slots (hereinafter referred to as slot allocation) may be indicated, and the details of the time domain resource allocation of PDSCH/PUSCH within one slot (hereinafter referred to as symbol allocation) may be indicated, which represents the allocation pattern. The symbol allocation specified in 2) is applied to all or at least a plurality of scheduled time slots of the time slot aggregation.

Fig. 11 shows an example of DL slot aggregation. The time domain resource allocation field specifies that 2 slots are aggregated and the PDSCH starts at symbol 1 and ends at symbol 11. The same pattern of PDSCH start and stop symbols is applied to both slots. Using exemplary tables 1 and 2 to indicate slot allocation and symbol allocation, the example in fig. 11 would use entries 001 or 101 for slot allocation (table 1, indicating 2 aggregated slots: 001 or 101, for different first slot values) and 011 for symbol allocation (table 2, assuming N _ slot = 14). As can be seen, fig. 11 shows DL slot aggregation with 2 slots. Each time slot uses the same time domain resource allocation. In this example, the slot length is N _ slot = 14.

UL slot aggregation is shown in fig. 12, where two slots are also aggregated. Symbol allocation designation: symbols 3 to 13 are used in each slot for PUSCH. Using exemplary tables 1 and 3 to indicate slot allocation and symbol allocation, the example in fig. 12 would use entries 001 or 101 for slot allocation (table 1 indicating 2 aggregated slots: 001 or 101 for different first slot values) and 101 (table 3, assuming N slot = 14) for symbol allocation. For UL slot aggregation with 2 slots in fig. 12, each slot uses the same time domain resource allocation (allocation pattern). In this example, the slot length is N _ slot = 14.

The time slot allocation will be discussed in more detail below.

The field indicating how many slots are scheduled may also indicate which slots are combined with at least some other information, such as a semi-statically configured slot offset. For DL, this will often be: the PDSCH starts in the same slot as the DCI message was received, in which case a simple slot length indicator would be sufficient. However, in UL, only fast terminals will be able to receive a UL grant (PDCCH) in a DCI message in slot n and transmit a PUSCH in slot n. Most terminals will only support transmission in slot n + 1. One possibility would be to semi-statically configure an offset value k, which indicates the reference slot position, so that the PUSCH always starts in slot n + k, given that DCI has been received in slot n. Table 1 shows a table in which the slot allocation contains 3 bits. The first bit indicates: the assignment begins in time slot n + n _ (OS, 1) or n + n _ (OS, 2), where n _ (OS, 1) and n _ (OS, 2) are offset values for the semi-static configuration, e.g., they may be 0 and 1 (typical values for DL), or 1 and 2 (typical values for UL). n is a slot in which DCI has been received. Therefore, the position of the first slot (start slot) as the reference slot is indicated. The remaining two bits indicate the number of aggregation slots, which in this example indicate 1 to 4 aggregation slots, but in a more general case the four values may be different, e.g. semi-statically configured.

Table 1 an exemplary slot allocation consists of 3 bits. The first bit indicates the first slot and the remaining two bits indicate the number of aggregated slots.

Number of one or more aggregated slots of bit pattern first slot

000 n+n_（OS,1） 1

001 n+n_（OS,1） 2

010 n+n_（OS,1） 3

011 n+n_（OS,1） 4

100 n+n_（OS,2） 1

101 n+n_（OS,2） 2

110 n+n_（OS,2） 3

111 n+n_（OS,2） 4

If the fixed (semi-statically configured) start positions of the data channels (PDSCH and PUSCH) are too constrained, start/stop allocations similar to LTE resource allocation format 2 can be considered for slot allocation. If non-contiguous slot aggregation is supported, a bitmap is required with a bit position for each slot that can be scheduled, e.g., [ b0 b1 b2 b3] may refer to slots n + k + bi, where n is the slot in which the DCI has been received and k is a fixed or semi-statically configured offset number.

Symbol allocation is discussed in more detail below.

Table 2 shows an example of how DL symbols are allocated to the PDSCH. Depending on the presence and form of the control channel region, PDSCH starting positions of 0 and 1 can imply: the PDSCH shares OFDM symbols with the PDCCH (assuming that the control channel region varies from 0 to 2 OFDM symbols). The PDSCH can extend up to the end of the slot (no UL opportunity at the end of the slot interval), or up to the symbol N _ slot-4 or N _ slot-3. For the latter two cases, 2 and 1 symbol UL opportunities have been considered along with 1 symbol guard time. N slot is the slot length and may be, for example, 7 or 14 symbols. To keep the number of bits at 3, the combination of start position 0 and end position N _ slot-4 has been omitted. The start and stop positions are provided in table 2, and the start (or stop) and length indications will be alternative signaling.

Table 2 symbol allocation for PDSCH

Bit pattern PDSCH Start symbol PDSCH stop symbol

000 0 N_slot-3

001 0 N_slot-1

010 1 N_slot-4

011 1 N_slot-3

100 1 N_slot-1

101 2 N_slot-4

110 2 N_slot-3

111 2 N_slot-1

Table 3 shows a similar table for PUSCH symbol allocation. PUSCH can start in symbol 1 (there is no DL and DL control region in this slot, i.e. PUSCH is scheduled from a previous slot, but 1 null symbol is needed at the beginning for switching time and timing advance) or in symbols 2, 3 and 4. The latter three cases assume a DL control region of 1 or 2 symbols together with a guard time of 1 or 2 symbols. If the DCI indicates PUSCH in the same slot and the UE requires more processing time, a longer guard period may be provided, for example, whereas if PUSCH is transmitted in the next slot or subframe, a 1 symbol guard period would be sufficient. The protection would only need to cover the UE switching time and timing advance if PUSCH is transmitted in the next slot or subframe. PUSCH can extend until the end of the slot, or stop earlier (in this example 1, the earlier 1 symbol that makes room for the short PUCCH in the end could also be 2 symbols, or even 1 or 2 symbols at the expense of additional signaling bits). It would also be possible to combine slot allocation (section 5.1.1) and symbol allocation since, for example, it may not be necessary to combine PUSCH starting in a future slot with PUSCH starting at symbol 4 (PUSCH starting symbol 4 would give the UE additional time to decode DCI if DCI was sent in the same slot). The start and stop positions are provided in table 3, and the start (or stop) and length indications will be alternative signaling.

Table 3 symbol allocation for PUSCH

Bit pattern PUSCH Start symbol PUSCH stop symbol

000 1 N_slot-2

001 1 N_slot-1

010 2 N_slot-2

011 2 N_slot-1

100 3 N_slot-2

101 3 N_slot-1

110 4 N_slot-2

111 4 N_slot-1

Extension

Applying the same symbol allocation to all slots may be too restrictive. For example, a DL slot aggregated PDSCH scheduled in slot n and starting at symbol 1 in slot n will have a hole at the beginning of all subsequent slots. To increase flexibility, a small signaling field for some/all slots may be provided in the downlink control information message to indicate the adjustment by indicating an indication of the deviation. However, the adjustment signaling (one or more deviation indications) may be limited to limit the signaling overhead.

Fig. 13 and 14 show examples of scheduling 4 slots in an aggregation. In fig. 13, without allowing for adjustment, the PDSCH would be mapped to symbols 1 to N _ slot-1 in each slot, i.e., there is a hole in the PDSCH in each slot. The adjustment is allowed for the first slot, possibly all slots are signaled PDSCH symbols allocated 0 to N _ slot-1 (entry 001 in table 2), but then the exception/adjustment of the first slot is signaled (PDSCH in the first slot starts at symbol 1), as shown in fig. 14. In this example, assume N _ slot = 7.

It should be noted that the mentioned exceptions/adjustments may be seen as deviations from the allocation pattern for a particular timeslot.

In particular, in fig. 13, symbols are allocated 1 to 6 (100 in table 2) for PDSCH for all slots, and a hole occurs in PDSCH mapping. In fig. 14, with the corresponding offset indication, all slots have symbols allocated 0 to 6 (001 in table 2) for PDSCH and holes in PDSCH mapping can be avoided. Adjustment signaling (deviation indication) is used for the first time slot.

Instead of explicit signaling of the adjustment to the first time slot, an implicit rule can be applied instead. An example rule would be that the start/stop symbol allocation is valid in all slots of the slot aggregation except the first slot, where the PDCCH symbol(s) containing DCI should be excluded from the start/stop allocation. Alternatively, if PDSCH start/stop/control region stop locations are indicated on the group common PDCCH, this information can be used to adjust the PDSCH start location in one or more slots of the slot aggregation (assuming the PDSCH starts after the PDCCH or control region if the PDCCH or control region stop location is signaled).

A similar technique can be used to signal the PDSCH, which is stopped early in the last slot to provide UL opportunities. In this case, the common symbol allocation will signal: the PDSCH is spread until the last symbol in each slot and the adjustment signaling for the last slot will indicate that the PDSCH stops, e.g., at symbol N _ slot-2. Alternatively, if DL stop/UL start positions are indicated on the group common PDCCH, this information can be used to adjust PDSCH stop positions in one or more slots of the slot aggregation.

The adjustment signaling can also be used for PUSCH. For example, PUSCH slot aggregation where the scheduling DCI starts at the first slot cannot start at symbol 0 in the first slot. Copying the same symbol allocation will again result in holes in the PUSCH map. Also, the common symbol allocation may signal that the PUSCH is mapped to symbols 0 to N _ slot-1 in all slots, and the adjustment signaling is used to modify the time domain resource allocation for the first slot.

Another possibility is to repeat the symbol allocation for only a subset of the allocated slots. Then, symbol allocations for other slots need to be provided by other means.

To be more flexible, symbol allocations can be provided for each allocated slot in the same DCI. This results in a larger signaling overhead, but since no other part of the DCI, such as the frequency domain resource allocation, is provided for each slot in the slot aggregation, the signaling is smaller than if a separate DCI is provided in each slot. Thus, the allocation pattern may cover exactly more than one time slot with different or the same sub-pattern.

In a DCI message, it may further be assumed that, in one example, the same frequency allocation is used in all allocated time slots. This is because it would then be possible to have one frequency allocation bit field for all aggregated slots in the DCI message.

To introduce some frequency diversity it can be possible to add a frequency hopping scheme applicable per time slot (and possibly even within a time slot). The frequency domain resources may be provided for each time slot (or a subset of time slots within a time slot aggregation) individually, or the frequency domain resources for at least one additional time slot can be derived using a rule given the frequency domain resources for at least one time slot.

It may generally be considered to provide a downlink control information message specifying such a time domain resource allocation for a time slot aggregation based on an allocation pattern for a single time slot, which is applied to other scheduled time slots of the time slot aggregation, in particular all scheduled time slots. This reduces the overhead required for signaling the time domain resource allocation in the slot aggregation.

Fig. 15 schematically shows a terminal or wireless device 10, which may be implemented as a UE (user equipment). The terminal 10 includes processing circuitry (which may also be referred to as control circuitry) 20 that may include a controller connected to memory. Any module of the terminal, such as a communication module or a transmitting module or a receiving module, may be implemented in the processing circuit 20 and/or executable by the processing circuit 20, in particular as a module in a controller. The terminal 10 further comprises radio circuitry 22 (e.g., one or more transmitters and/or receivers and/or transceivers) providing receiving and transmitting or transceiving functionality, the radio circuitry 22 being connected or connectable to processing circuitry. The antenna circuit 24 of the terminal 10 is connected or connectable to the radio circuit 22 for collecting or transmitting and/or amplifying signals. The radio circuit 22 and the processing circuit 20 controlling it are configured for cellular communication with a network, such as a RAN as described herein. The terminal 10 may generally be adapted to perform any of the methods of operating a terminal or UE disclosed herein; in particular, it may comprise corresponding circuitry, e.g. processing circuitry and/or modules.

Fig. 16 schematically shows a network node 100, which may in particular be an eNB or a gNB or similar node for NR. The network node 100 comprises processing circuitry (which may also be referred to as control circuitry) 120, which may comprise a controller connected to a memory. Any modules of the network node 100, such as the transmitting module and/or the receiving module and/or the configuration module, may be implemented in the processing circuit 120 and/or executable by the processing circuit 120. The processing circuit 120 is connected to a control radio circuit 122 of the radio node 100, which provides receiver and transmitter and/or transceiver functionality (e.g. comprising one or more transmitters and/or receivers and/or transceivers). The antenna circuit 124 may be connected or connectable to the radio circuit 122 for signal reception or transmission (transmission) and/or amplification. The network node 100 may be adapted to perform any of the methods for operating a network node disclosed herein; in particular, it may comprise corresponding circuitry, e.g. processing circuitry and/or modules. The antenna 124 circuitry may be connected to and/or include an antenna array. The network node 100, respectively its circuitry, may be adapted to communicate configuration data and/or configure a terminal as described herein.

Fig. 17 shows an illustration of an exemplary method of operating a user device, which may be any of the user devices described herein. The method comprises the communication action TS10 as disclosed herein.

Fig. 18 shows a schematic diagram of an exemplary user device. The user equipment may comprise a communication module TM10 for performing the action TS 10.

Fig. 19 shows an illustration of an exemplary method of operating a network node, which may be any network node described herein, in particular a gNB or eNB. The method comprises an act NS10 of transmitting a downlink control information message as disclosed herein.

Fig. 20 shows a schematic diagram of an exemplary network node. The network node may comprise a transfer module NM10 for performing the action NS 10.

The uplink control channel is described hereinafter. NR will support Physical Uplink Control Channels (PUCCH) of different formats. The PUCCH carries Uplink Control Information (UCI) including acknowledgement signaling, such as HARQ feedback (ACK/NACK), and/or Channel Quality Information (CQI), and/or Scheduling Requests (SR).

The indication may generally explicitly and/or implicitly indicate the information it represents and/or indicates. The implicit indication may be based on, for example, a location and/or resources used for the transmission. The explicit indication may be based on, for example, a parameterization (parameter) having one or more parameters and/or one or more indices and/or one or more bit patterns representing information. The acknowledgement signaling may include one or more bits for acknowledging the signaling process (e.g., for ACK/NACK), and/or additional information, such as an indication that no data elements were received and/or scheduled.

The signaling may generally comprise one or more symbols and/or signals and/or messages. The signal may comprise one or more bits. The indication may represent signaling and/or be implemented as a signal or multiple signals. One or more signals may be included in and/or represented by a message. Signaling, and in particular acknowledgement signaling, may comprise a plurality of signals and/or messages that may be communicated over different carriers and/or associated with different acknowledgement signaling procedures, e.g., representing and/or involving one or more such procedures. The indication may comprise signaling and/or a plurality of signals and/or messages, which may be transmitted on different carriers and/or associated with different acknowledgement signaling procedures, e.g., indicative of and/or related to one or more such procedures. The message may represent a jointly coded and/or modulated data block, and/or information (e.g., one or more indications) conveyed together. The message may be addressed to a specific receiver, e.g. a user equipment. The message may be considered to have a format that may be defined according to a standard, in particular according to a 3GPP standard like NR.

A radio node may generally be seen as a device or node adapted for wireless and/or radio (and/or microwave) frequency communication and/or communication utilizing an air interface, e.g. according to a communication standard.

The radio node may be a network node, or a user equipment or a terminal. The network node may be any radio node of a wireless communication network, such as a base station and/or a gsdeb (gnb) and/or a relay node and/or a micro/femto/pico/femto node and/or other nodes, in particular for a RAN as described herein.

In the context of the present disclosure, the terms wireless device, User Equipment (UE) and terminal may be considered interchangeable. A wireless device, user equipment or terminal may represent a terminal device that communicates using a wireless communication network and/or be implemented as user equipment according to a standard. Examples of user equipment may include a phone, such as a smartphone, a personal communication device, a mobile phone or terminal, a computer, in particular a laptop, a sensor or machine, in particular for MTC (machine type communication, sometimes also referred to as M2M machine to machine), having radio capability (and/or being adapted for an air interface), or a vehicle adapted for wireless communication. The user equipment or terminal may be mobile or fixed.

The radio node may typically comprise processing circuitry and/or radio circuitry. The circuit may comprise an integrated circuit. The processing circuitry may comprise one or more processors and/or controllers (e.g., microcontrollers) and/or ASICs (application specific integrated circuits) and/or FPGAs (field programmable gate arrays), etc. It can be considered that the processing circuitry comprises and/or is (operatively) connected or connectable to one or more memories or memory arrangements. The memory arrangement may comprise one or more memories. The memory may be adapted to store digital information. Examples of memory include volatile and non-volatile memory and/or Random Access Memory (RAM) and/or Read Only Memory (ROM) and/or magnetic and/or optical memory and/or flash memory and/or hard disk memory and/or EPROM or EEPROM (erasable programmable ROM or electrically erasable programmable ROM). The radio circuit may comprise one or more transmitters and/or receivers and/or transceivers (which may operate or be operable as transmitters and receivers), and/or may comprise one or more amplifiers and/or oscillators and/or filters, and/or may comprise and/or be connected or connectable to the antenna circuit and/or one or more antennas.

Any or all of the modules disclosed herein may be implemented in software and/or firmware and/or hardware. Different modules may be associated with different components of the radio node, e.g. different circuits or different parts of circuits. Modules may be considered to be distributed over different components and/or circuits.

The radio access network may be a wireless communication network and/or may be a Radio Access Network (RAN), in particular according to a communication standard. The communication standard may particularly be a standard evolved according to 3GPP and/or 5G, e.g. according to NR or LTE, in particular according to LTE.

Generally, a program product is contemplated comprising instructions adapted to cause processing and/or control circuitry, in particular when executed thereon, to perform and/or control any of the methods described herein. Furthermore, a carrier medium arrangement is contemplated, which carries and/or stores the program product as described herein.

The carrier medium arrangement may comprise one or more carrier media. In general, the carrier medium may be accessible and/or readable and/or receivable by the processing or control circuitry. Storing data and/or program products and/or code may be considered as carrying data and/or program products and/or code portions. The carrier medium may typically comprise a guide/transmission medium and/or a storage medium. The guiding/transmission medium may be adapted to carry and/or store signals, in particular electromagnetic signals and/or electrical signals and/or magnetic signals and/or optical signals. The carrier medium, in particular the guiding/transmission medium, may be adapted to guide such signals to carry them. The carrier medium, in particular the guiding/transmission medium, may comprise an electromagnetic field, such as radio waves or microwaves, and/or an optically transparent material, such as glass fibers, and/or a cable. The storage medium may include at least one of memory, buffer, cache, optical disk, magnetic memory, flash memory, and the like, which may be volatile or non-volatile.

The wireless communication network may be and/or comprise a Radio Access Network (RAN), which may be and/or comprise any kind of cellular and/or wireless radio network, which may be connected or connectable to a core network. The methods described herein are particularly suitable for 5G networks, such as LTE evolution and/or NR (new air interface), respectively its successors. The RAN may include one or more network nodes. The network node may particularly be a radio node adapted for radio and/or wireless and/or cellular communication with one or more terminals. The terminal may be any device suitable for radio and/or wireless and/or cellular communication with or within the RAN, such as a User Equipment (UE) or a mobile phone or a smartphone or a computing device or a vehicle communication device or a device for Machine Type Communication (MTC) or the like. The terminal may be mobile or in some cases fixed.

The transmission in the downlink may involve transmission from the network or network node to the terminal. The transmission in the uplink may involve transmission from the terminal to the network or network node.

The signaling may generally include one or more signals and/or one or more symbols. The reference signaling may include one or more reference signals or symbols.

The resource elements may generally describe the smallest individually available and/or encodable and/or decodable and/or modulatable and/or demodulatable time-frequency resources and/or may describe time-frequency resources covering symbol time lengths in time and subcarriers in frequency. The signal may be allocable and/or assigned to a resource element. The subcarriers may be subbands of a carrier as defined by a standard, for example. A carrier may define a frequency and/or a frequency band for transmission and/or reception. In some variations, a signal (joint coding/modulation) may cover more than one resource element. The resource elements may be generally as defined by a corresponding standard (e.g., NR or LTE).

The resources may generally represent time-frequency resources on which signaling according to a particular format may be transmitted and/or intended to be transmitted, and/or code resources and/or power resources. The format may include one or more sub-structures that may be considered to represent corresponding sub-resources (as they would be transmitted in a portion of the resources).

The control information or control information message or corresponding signaling may be transmitted on a control channel (e.g., a physical control channel), which may be a downlink channel or an uplink channel. For example, downlink control information, e.g. a corresponding message, may be signaled by the network node on PDCCH (physical downlink control channel) and/or PDSCH (physical downlink shared channel) and/or HARQ specific channels. Uplink control information, e.g., acknowledgement signaling, may be transmitted by the terminal on PUCCH (physical uplink control channel) and/or PUSCH (physical uplink shared channel) and/or HARQ specific channels. Multiple channels may be applied for multi-component/multi-carrier indication or signaling.

Configuring a radio node, in particular a terminal or user equipment, may mean that the radio node is adapted or caused or arranged to operate according to the configuration. The configuration may be done by another apparatus, e.g. a network node (e.g. a radio node of the network, such as a base station or eNodeB) or the network, in which case it may comprise transmitting configuration data to the radio node to be configured. Such configuration data may represent a configuration to be configured and/or include one or more instructions related to the configuration, e.g., first signaling (e.g., data transmission) and/or start symbol related to one or more transmission timing structures and/or schedules. The radio node may configure itself, e.g. based on configuration data received from the network or network node. The network node may utilize and/or be adapted to utilize its one or more circuits for configuration.

In general, configuring may include determining configuration data representing the configuration and providing it (in parallel and/or serially) to one or more other nodes, which may transmit it further to the radio node (or another node, which may be repeated until it reaches the wireless device). Alternatively or additionally, configuring the radio node, e.g. by a network node or other means, may comprise: for example receiving configuration data and/or data related to configuration data from another node like a network node, which may be a higher level node of the network, and/or transmitting the received configuration data to the radio node. Thus, determining the configuration and transmitting the configuration data to the radio node may be performed by different network nodes or entities, which may be able to communicate via a suitable interface (e.g. the X2 interface in case of LTE or a corresponding interface for NR). Configuring the terminal may include: scheduling downlink and/or uplink transmissions, e.g. downlink data and/or downlink control signaling and/or DCI and/or uplink signaling, in particular acknowledgement signaling, for a terminal; and/or configuring resources and/or resource pools therefor.

The control signaling may be considered signaling of control information and/or signaling including control information. The control information may be provided in a control information message. In particular, the control information may comprise scheduling information, such as grants (of one or more uplink and/or downlink and/or sidelink resources) and/or a time slot allocation indication and/or a symbol allocation indication and/or power control information and/or link adaptation information and/or precoding information, e.g. scheduling information for downlink or downlink control information. In other cases, the control information may include acknowledgement signaling (and, correspondingly, associated acknowledgement information), and in some variations, scheduling request information and/or measurement related information, e.g., control information for uplink or uplink control information.

A carrier may generally represent a frequency range or band. A carrier may be considered to comprise a plurality of subcarriers. A carrier may have been assigned its center frequency or center frequency spacing, e.g., a carrier represented by one or more subcarriers (each subcarrier may typically be assigned a frequency bandwidth or spacing). The different carriers may not overlap and/or may be adjacent in frequency space.

It should be noted that in the present disclosure, the term "radio" may be considered to relate generally to wireless communication, and may also include wireless communication using microwave frequencies.

A radio node, in particular a network node or a terminal, may generally be any device adapted to transmit and/or receive radio and/or wireless signals and/or data, in particular communication data, in particular on at least one carrier. The at least one carrier may include a carrier (which may be referred to as an LBT carrier) that is accessed based on an LBT procedure, e.g., an unlicensed carrier. The carriers may be considered as part of carrier aggregation.

Receiving or transmitting on a cell or carrier may refer to receiving or transmitting using a frequency (band) or spectrum associated with the cell or carrier. A cell may generally comprise and/or be defined by one or more carriers, in particular at least one carrier for UL communication/transmission (referred to as UL carrier) and at least one carrier for DL communication/transmission (referred to as DL carrier). It can be considered that a cell includes different numbers of UL carriers and DL carriers. Alternatively or additionally, for example, in a TDD-based approach, a cell may include at least one carrier for UL and DL communications/transmissions.

The channels may typically be logical channels, transport channels, or physical channels. A channel may comprise and/or be arranged on one or more carriers, in particular on a plurality of subcarriers.

In general, a symbol may represent and/or be associated with a symbol time length, which may depend on a set of parameters of the carrier and/or subcarrier spacing and/or associated carrier. Thus, a symbol may be considered to indicate a time interval having a symbol time length relative to the frequency domain.

A sidelink may generally represent a communication channel (or channel structure) between two UEs and/or terminals, wherein data is subsequently communicated between the participants (UEs and/or terminals) via the communication channel, e.g., directly and/or not via a network node. The sidelink may be established solely and/or directly via one or more air interfaces of the participants, which may be directly linked via sidelink communication channels. In some variations, the sidelink communications may be performed without network node interaction, e.g., on fixedly defined resources and/or on resources negotiated between the participants. Alternatively or additionally, it may be considered that the network node provides some control functionality, e.g. by configuring resources, in particular one or more resource pools, for sidelink communication and/or monitoring sidelinks, e.g. for charging purposes.

Sidelink communications may also be referred to as device-to-device (D2D) communications and/or, in some cases, for example, in the context of LTE, as ProSe (proximity services) communications. The sidelink may be implemented in the context of V2x communications (vehicle communications), such as V2V (vehicle-to-vehicle), V2I (vehicle-to-infrastructure), and/or V2P (vehicle-to-person). Any device suitable for sidelink communications may be considered a user equipment or terminal.

The sidelink communication channel (or structure) may comprise one or more (e.g., physical or logical) channels, such as a PSCCH (physical sidelink control channel, which may carry control information such as acknowledgement location indications, for example) and/or a PSCCH (physical sidelink shared channel, which may carry data and/or acknowledgement signaling, for example). A sidelink communication channel (or structure) may be considered to relate to and/or use one or more carriers and/or one or more frequency ranges associated with and/or used by cellular communications, for example, according to a particular license and/or standard. The participants may share (physical) channels and/or resources, in particular in the frequency space and/or related to frequency resources (e.g. carriers) of the sidelink, such that e.g. two or more participants transmit simultaneously and/or time shifted thereon, and/or there may be specific channels and/or resources associated with a specific participant such that e.g. only one participant transmits on a specific channel or on one or more specific resources, e.g. in the frequency space and/or related to one or more carriers or subcarriers.

The sidelink may conform to and/or be implemented in accordance with a particular standard, such as an LTE-based standard and/or NR. For example, the sidelinks may utilize TDD (time division duplex) and/or FDD (frequency division duplex) techniques configured by the network node and/or preconfigured and/or negotiated between the participants. For example, a user equipment may be considered suitable for sidelink communication if the user equipment and/or its radio circuitry and/or processing circuitry is adapted to utilize a sidelink over one or more frequency ranges and/or carriers and/or in one or more formats, in particular according to a particular standard. A radio access network can be generally considered to be defined by two parties to a sidelink communication. Alternatively or additionally, the radio access network may be denoted and/or related to and/or defined by network nodes and/or communicate with such nodes.

Communicating or communicating may generally include transmitting and/or receiving signaling. The signaling may be associated with a particular channel. Communication on the sidelink (or sidelink signaling) may include utilizing the sidelink for communication (and, accordingly, using the sidelink for signaling). Sidelink transmissions and/or transmissions on sidelink may be considered to include transmissions using sidelink, e.g., transmissions using associated resources and/or transmission formats and/or circuitry and/or air interface. Sidelink reception and/or reception on a sidelink may be considered to include reception using the sidelink, e.g., using associated resources and/or transport formats and/or circuitry and/or an air interface. Sidelink control information (e.g., SCI) may generally be considered to include control information conveyed using sidelink. Acknowledgement signaling as well as signaling acknowledging the location indication can be seen as an example of an SCI, although the direction of communication differs between the participants. In particular, acknowledgement signaling may be considered responsive to other control signaling (e.g., configuration control signaling) and is therefore referred to as responsive control signaling. The configuration control signaling may generally configure the UE, e.g., schedule resources and/or resource pools. Signaling of acknowledgement position indications may be considered as an example of configuration control signaling.

The transmission timing structures may have a duration (length in time) determined based on the duration of their symbols, possibly with one or more cyclic prefixes used. The symbols of the transmission timing structure may have the same duration, or in some variations may have different durations. A slot may be considered an example of a transmission timing structure, and in the context of this disclosure, the term slot may be considered interchangeable with the term transmission timing structure. The transmission timing structure or slot may comprise a predetermined number of symbols, for example 7 or 14. A mini-slot may include a number of symbols that is less than the number of symbols of the slot. The transmission timing structure may cover a time interval of a particular length, which may depend on the symbol time length and/or cyclic prefix used. The transmission timing structure may relate to and/or cover a particular time interval in a time stream that is synchronized, for example, for communication. It should be noted that a subframe may be considered as an example of a slot or transmission timing structure having a fixed duration of 1 ms.

In the present disclosure, for purposes of explanation and not limitation, specific details are set forth, such as particular network functions, procedures, and signaling steps, in order to provide a thorough understanding of the techniques presented herein. It will be apparent to those skilled in the art that the present concepts and aspects may be practiced with modifications and other variations that depart from these specific details.

For example, these concepts and variations are described in the context of Long Term Evolution (LTE) or LTE-advanced (LTE-a) or next radio mobile or wireless communication technology; however, this does not preclude the use of the present concepts and aspects in conjunction with additional or alternative mobile communication technologies, such as global system for mobile communications (GSM). While the following variations will be described, in part, with respect to certain Technical Specifications (TSs) of the third generation partnership project (3 GPP), it will be appreciated that the present concepts and aspects can also be implemented in connection with different Performance Management (PM) specifications.

Further, those skilled in the art will recognize that the services, functions, and steps described herein may be implemented using software functioning in conjunction with a programmed microprocessor or using an Application Specific Integrated Circuit (ASIC), a Digital Signal Processor (DSP), a Field Programmable Gate Array (FPGA), or a general purpose computer. It will also be appreciated that while variations described herein are set forth in the context of methods and apparatus, the concepts and aspects presented herein may also be embodied in a program product as well as a system comprising control circuitry (e.g., a computer processor and a memory coupled to the processor) wherein the memory is encoded with one or more programs or program products that perform the services, functions and steps disclosed herein.

It is believed that the advantages of the aspects and variations set forth herein will be fully understood from the foregoing description, and it will be apparent that various changes may be made in the form, construction and arrangement of the exemplary aspects thereof without departing from the scope of the concepts and aspects set forth herein or without sacrificing all of its material advantages. The aspects presented herein can be varied in many ways.

Some useful abbreviations include:

description of abbreviations

DCI downlink control information

PDCCH physical downlink control channel

PDSCH physical shared data channel

PUCCH physical uplink control channel

PUSCH physical uplink shared channel

RRC radio resource control

TDD time division duplex