阅读说明：本技术 用于动态波束对确定的方法和装置 (Method and apparatus for dynamic beam pair determination ) 是由 朱隽 R·N·查拉 于 2018-12-12 设计创作，主要内容包括：在基站与具有毫米波(mmW)能力的UE之间的许多可用波束对之中选择发射(Tx)-接收(Rx)波束同该基站与该UE之间的传输性能直接相关。公开了一种在能够进行(mmW)通信的传送方用户装备(UE)处的方法、装置和计算机可读介质以基于多个Tx-Rx波束对的累积强度来确定新的服务Tx-Rx波束对。该UE可以迭代地执行一过程,直到达到预定数目的同步循环：选择多个发射(Tx)-接收(Rx)波束对中在当前同步时段内尚未被测量的一个Tx-Rx波束对,该选择至少部分地基于所选Tx-Rx波束对的调度机会值；以及测量所选Tx-Rx波束对的强度。(Selecting a transmit (Tx) -receive (Rx) beam among a number of available beam pairs between a base station and a millimeter wave (mmW) capable UE is directly related to the transmission performance between the base station and the UE. A method, apparatus, and computer readable medium at a transmitting User Equipment (UE) capable of (mmW) communication is disclosed to determine a new serving Tx-Rx beam pair based on cumulative strength of multiple Tx-Rx beam pairs. The UE may iteratively perform a process until a predetermined number of synchronization cycles are reached: selecting one of a plurality of transmit (Tx) -receive (Rx) beam pairs that has not been measured for a current synchronization period, the selecting based at least in part on a scheduling opportunity value of the selected Tx-Rx beam pair; and measuring the strength of the selected Tx-Rx beam pair.)

1. A method of wireless communication at a User Equipment (UE) capable of millimeter wave (mmW) communication, comprising:

iteratively performing a process until a predetermined number of synchronization cycles is reached, the process comprising:

selecting one transmit (Tx) -receive (Rx) beam pair from a plurality of Tx-Rx beam pairs that has not been measured for a current synchronization period, the selecting based at least in part on a scheduling opportunity value for the selected Tx-Rx beam pair; and

measuring the strength of the selected Tx-Rx beam pair; and

determining a new serving Tx-Rx beam pair based on the cumulative strength of the plurality of Tx-Rx beam pairs.

2. The method of claim 1, further comprising:

switching to the determined new serving Tx-Rx beam pair; and

transmitting and/or receiving data using the new serving Tx-Rx beam pair.

3. The method of claim 1, further comprising:

a Tx beam set from a serving base station is received in a broadcast message.

4. The method of claim 1, wherein the scheduling opportunity value for the Tx-Rx beam pair is determined based at least in part on a priority weight, a Cumulative Density Function (CDF) of measured intensities of the selected Tx-Rx beam pair, or a combination thereof.

5. The method of claim 4, wherein the priority weights of the Tx-Rx beam pairs are updated based in part on spatial proximity between the Tx-Rx beam pairs, whether a line of sight (LOS) exists between the Tx-Rx beam pairs, the priority weights of the Tx-Rx beam pairs, or a combination thereof.

6. The method of claim 5, wherein the scheduling opportunity value is proportional to a probability that the Tx-Rx beam pair is selected for measurement during the predetermined number of synchronization cycles, and wherein a scheduling ratio of the Tx-Rx beam pair to a second Tx-Rx beam pair and a ratio of the priority weight of the Tx-Rx beam pair to a second priority weight of the second Tx-Rx beam pair are related.

7. The method of claim 5, further comprising:

assigning an initial scheduling opportunity value to each of the Tx-Rx beam pairs by:

assigning the same initial value to each of the Tx-Rx beam pairs; or

Assigning the initial scheduling opportunity value to each of the Tx-Rx beam pairs based in part on spatial proximity between the Tx-Rx beam pairs and historical data of the Tx-Rx beam pairs.

8. The method of claim 1, wherein selecting one of the plurality of Tx-Rx beam pairs further comprises: selecting an Rx beam and a Tx beam to form the Tx-Rx beam pair without being constrained by a fixed Rx beam pattern or a fixed Tx beam pattern.

9. The method of claim 1, wherein determining the new serving Tx-Rx beam pair further comprises: selecting a Tx-Rx beam pair with a highest accumulated beam strength as the new serving Tx-Rx beam pair, wherein the highest accumulated beam strength is a sum of the beam strengths of the Tx-Rx beam pair for the duration of the predetermined number of synchronization cycles.

10. The method of claim 4, wherein measuring the strength of the selected Tx-Rx beam pair further comprises:

measuring one or more of a signal-to-noise ratio (SNR), a signal-to-noise/interference ratio (SNIR), a Reference Signal Received Quality (RSRQ), a Reference Signal Received Power (RSRP), or a beam gain of the selected Tx-Rx beam pair;

updating the priority weights for the selected Tx-Rx beam pairs based in part on the measured strengths;

updating the scheduling opportunity value based in part on the updated priority weight; or

Combinations thereof.

11. An apparatus for wireless communication, comprising:

apparatus for iteratively performing a process until a predetermined number of synchronization cycles is reached, the process comprising:

selecting one of a plurality of transmit (Tx) -receive (Rx) beam pairs that has not been measured for a current synchronization period, the selecting based at least in part on a scheduling opportunity value of the selected Tx-Rx beam pair; and

measuring the strength of the selected Tx-Rx beam pair; and

means for determining a new serving Tx-Rx beam pair based on the cumulative strength of the plurality of Tx-Rx beam pairs.

12. The apparatus of claim 11, further comprising

Means for switching to the determined new serving Tx-Rx beam pair; and

means for transmitting and/or receiving data using the new serving Tx-Rx beam pair.

13. The apparatus of claim 11, further comprising

Means for receiving a Tx beam set from a serving base station in a broadcast message.

14. The apparatus of claim 11, wherein the scheduling opportunity value for the Tx-Rx beam pair is determined based at least in part on a priority weight, a Cumulative Density Function (CDF) of measured intensities of the selected Tx-Rx beam pair, or a combination thereof.

15. The apparatus of claim 14, wherein the priority weights of the Tx-Rx beam pairs are updated based in part on spatial proximity between the Tx-Rx beam pairs, whether line of sight (LOS) exists between the Tx-Rx beam pairs, the priority weights of the Tx-Rx beam pairs, or a combination thereof.

16. The apparatus of claim 15, wherein the scheduling opportunity value is proportional to a probability that the Tx-Rx beam pair is selected for measurement during the predetermined number of synchronization cycles, and wherein a scheduling ratio of the Tx-Rx beam pair to a second Tx-Rx beam pair and a ratio of the priority weight of the Tx-Rx beam pair to a priority weight of the second Tx-Rx beam pair are related.

17. The apparatus of claim 15, further comprising

Means for assigning an initial scheduling opportunity value to each of the Tx-Rx beam pairs by:

assigning the same initial value to each of the Tx-Rx beam pairs; or

Assigning the initial scheduling opportunity value to each of the Tx-Rx beam pairs based in part on spatial proximity between the Tx-Rx beam pairs and historical data of the Tx-Rx beam pairs.

18. The apparatus of claim 11, wherein the means for selecting one of the plurality of Tx-Rx beam pairs further comprises: selecting an Rx beam and a Tx beam to form the Tx-Rx beam pair without being constrained by a fixed Rx beam pattern or a fixed Tx beam pattern.

19. The apparatus of claim 11, wherein the means for determining the new serving Tx-Rx beam pair further comprises: selecting a Tx-Rx beam pair with a highest accumulated beam strength as the new serving Tx-Rx beam pair, wherein the highest accumulated beam strength is a sum of the beam strengths of the Tx-Rx beam pair for the duration of the predetermined number of synchronization cycles.

20. The apparatus of claim 14, wherein measuring the strength of the selected Tx-Rx beam pair further comprises:

measuring one or more of a signal-to-noise ratio (SNR), a signal-to-noise/interference ratio (SNIR), a Reference Signal Received Quality (RSRQ), a Reference Signal Received Power (RSRP), or a beam gain of the selected Tx-Rx beam pair;

updating the priority weights for the selected Tx-Rx beam pairs based in part on the measured strengths;

updating the scheduling opportunity value based in part on the updated priority weight; or

Combinations thereof.

21. An apparatus for wireless communication, comprising:

a transceiver;

a memory; and

at least one processor coupled to at least one of the memories and configured to:

iteratively performing a process until a predetermined number of synchronization cycles is reached, the process comprising:

selecting one of a plurality of transmit (Tx) -receive (Rx) beam pairs that has not been measured for a current synchronization period, the selecting based at least in part on a scheduling opportunity value of the selected Tx-Rx beam pair; and

measuring the strength of the selected Tx-Rx beam pair; and

determining a new serving Tx-Rx beam pair based on the cumulative strength of the plurality of Tx-Rx beam pairs.

22. The apparatus of claim 21, wherein the at least one processor is further configured to:

switching to the determined new serving Tx-Rx beam pair; and

transmitting and/or receiving data using the new serving Tx-Rx beam pair.

23. The apparatus of claim 21, wherein the at least one processor is further configured to:

a Tx beam set from a serving base station is received in a broadcast message.

24. The apparatus of claim 21, wherein the scheduling opportunity value for the Tx-Rx beam pair is determined based at least in part on a priority weight, a Cumulative Density Function (CDF) of measured intensities of the selected Tx-Rx beam pair, or a combination thereof.

25. The apparatus of claim 24, wherein the priority weights of the Tx-Rx beam pairs are updated based in part on spatial proximity between the Tx-Rx beam pairs, whether line of sight (LOS) exists between the Tx-Rx beam pairs, the priority weights of the Tx-Rx beam pairs, or a combination thereof.

26. The apparatus of claim 25, wherein the scheduling opportunity value is proportional to a probability that the Tx-Rx beam pair is selected for measurement during the predetermined number of synchronization cycles, and wherein a scheduling ratio of the Tx-Rx beam pair to a second Tx-Rx beam pair and a ratio of the priority weight of the Tx-Rx beam pair to a priority weight of the second Tx-Rx beam pair are related.

27. The apparatus of claim 25, wherein the at least one processor is further configured to:

assigning an initial scheduling opportunity value to each of the Tx-Rx beam pairs by:

assigning the same initial value to each of the Tx-Rx beam pairs; or

Assigning the initial scheduling opportunity value to each of the Tx-Rx beam pairs based in part on spatial proximity between the Tx-Rx beam pairs and historical data of the Tx-Rx beam pairs.

28. The apparatus of claim 21, wherein the at least one processor is further configured to: selecting one of the plurality of Tx-Rx beam pairs further by selecting an Rx beam and a Tx beam to form the Tx-Rx beam pair without constraints of a fixed Rx beam pattern or a fixed Tx beam pattern.

29. The apparatus of claim 21, wherein the at least one processor is further configured to: determining the new serving Tx-Rx beam pair by selecting as the new serving Tx-Rx beam pair the Tx-Rx beam pair having the highest accumulated beam strength, wherein the highest accumulated beam strength is the sum of the beam strengths of the Tx-Rx beam pair for the duration of the predetermined number of synchronization cycles.

30. The apparatus of claim 24, wherein measuring the strength of the selected Tx-Rx beam pair further comprises:

measuring one or more of a signal-to-noise ratio (SNR), a signal-to-noise/interference ratio (SNIR), a Reference Signal Received Quality (RSRQ), a Reference Signal Received Power (RSRP), or a beam gain of the selected Tx-Rx beam pair;

updating the priority weights for the selected Tx-Rx beam pairs based in part on the measured strengths;

updating the scheduling opportunity value based in part on the updated priority weight; or

Combinations thereof.

Background

Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasting. Typical wireless communication systems may employ multiple-access techniques capable of supporting communication with multiple users by sharing the available system resources. Examples of such multiple-access techniques include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems.

These multiple access techniques have been adopted in various telecommunications standards to provide a common protocol that enables different wireless devices to communicate on a city, country, region, and even global level. An example telecommunication standard is the 5G New Radio (NR). The 5G NR is part of a continuous mobile broadband evolution promulgated by the third generation partnership project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with the internet of things (IoT)), and other requirements. Some aspects of the 5GNR may be based on the 4G Long Term Evolution (LTE) standard. There is a need for further improvements in the 5G NR technology. These improvements are also applicable to other multiple access techniques and telecommunications standards employing these techniques.

NR may support various wireless communication services, such as enhanced mobile broadband (eMBB) targeting wide bandwidths (e.g., over 80MHz), millimeter wave (mmW) targeting high carrier frequencies (e.g., 60GHz), massive MTC (MTC) targeting non-backward compatible MTC technologies, and/or mission critical targeting ultra-reliable low latency communication (URLLC). These services may include latency and reliability requirements. These services may also have different Transmission Time Intervals (TTIs) to meet corresponding quality of service (QoS) requirements. In addition, these services may coexist in the same subframe.

The wireless communication system may also include or support a network, also referred to as a vehicle networking (V2X), vehicle-to-vehicle (V2V) network, and/or cellular V2X (C-V2X) network, used for vehicle-based communication. Vehicle-based communication networks may provide always-on telematics, where UEs (e.g., vehicular UEs (V-UEs)) communicate directly with the network (V2N), with pedestrian UEs (V2P), with infrastructure equipment (V2I), and with other V-UEs (e.g., via the network). Vehicle-based communication networks may support a safe, always-on driving experience by providing intelligent connectivity in which traffic signals/timing, real-time traffic and route planning, safety alerts to pedestrians/riders, collision avoidance information, and the like are exchanged.

However, such networks that support vehicle-based communications may also be associated with various requirements (e.g., communication requirements, security and privacy requirements, etc.). Other example requirements may include, but are not limited to, reduced latency requirements, higher reliability requirements, and the like. For example, vehicle-based communication may include communicating sensor data that may support an autonomous automobile. Sensor data may be used between vehicles to improve the safety of an autonomous vehicle.

SUMMARY

The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

Selecting a transmit (Tx) -receive (Rx) beam pair among many available beam pairs between a base station and a mmW capable UE is directly related to the transmission performance between the base station and the UE. The current common approach to selecting active Tx-Rx beam pairs is to measure each beam pair from a plurality of available beam pairs in a round-robin fashion and determine a new active beam pair based on the measurement results. In this round robin fashion, each beam pair has equal scheduling opportunities to make measurements in the synchronization cycle. In fact, the chances of a beam pair being selected as an active beam pair are different due to factors such as line of sight (LoS) and proximity between the beam pairs. This round robin approach does not distinguish between these beam pairs and thus may result in a longer latency in selecting the active beam pair.

Accordingly, there is a need for a method, apparatus, and computer-readable medium at a User Equipment (UE) in a mmW communication environment to randomly assign scheduling opportunities to each beam pair to quickly converge on a good active beam pair taking into account factors such as LoS, proximity, and the like. A method, apparatus, and computer readable medium at a transmitting User Equipment (UE) capable of (mmW) communication is disclosed to determine a new serving Tx-Rx beam pair based on cumulative strength of multiple Tx-Rx beam pairs. The UE may iteratively perform a process until a predetermined number of synchronization cycles is reached, the process comprising: selecting one of a plurality of transmit (Tx) -receive (Rx) beam pairs that has not been measured for a current synchronization period, the selecting based at least in part on a scheduling opportunity value of the selected Tx-Rx beam pair; and measuring the strength of the selected Tx-Rx beam pair.

To the accomplishment of the foregoing and related ends, the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed and the present description is intended to include all such aspects and their equivalents.