阅读说明：本技术 用于资源扩展多址(rsma)的基于序列的短码设计 (Sequence-based short code design for resource-extended multiple access (RSMA) ) 是由 S·朴 雷静 R·王 J·B·索里亚加 蒋靖 T·姬 N·布衫 于 2019-01-11 设计创作，主要内容包括：本公开的各方面提供了允许为UE指派供在RSMA中使用的码序列的设计。(Aspects of the present disclosure provide a design that allows a UE to be assigned a code sequence for use in RSMA.)

1. A method of wireless communication by a Base Station (BS), comprising:

assigning a set of sequences to a set of User Equipments (UEs), wherein the set of sequences is designed to satisfy one or more criteria to achieve low cross-correlation across sequences in the set, and the set of sequences is dependent on a Spreading Factor (SF) and a number of UEs (N);

receiving a signal comprising transmissions from one or more UEs in the set of UEs, wherein each transmission from a UE is scrambled using one of the sequences in the set as a scrambling sequence;

determining the scrambling sequence for each transmission; and

each transmission is decoded based on the determined scrambling sequence.

2. The method of claim 1, wherein the decoding comprises performing at least one of the following based on different sequences in the set used to scramble the transmission: to distinguish between different UEs or to distinguish between different transport layers.

3. The method of claim 2, wherein the decoding further comprises:

determining, for each transmission, a UE-specific scrambling sequence for further scrambling the transmission; and

identifying each UE based on the UE-specific scrambling sequence.

4. The method of claim 3, wherein each UE-specific scrambling sequence is longer than the sequences in the set of sequences.

5. The method of claim 1, wherein the one or more criteria comprise at least one of:

the sum of the squares of the cross-correlations across the sequences in the set reaches a fundamental limit; or

The individual sequence cross-correlations for each pair of sequences in the set reach a fundamental limit.

6. The method of claim 5, wherein each sequence in the set comprises: a truncated Chu sequence generated based on the SF, N, and sequence index.

7. The method of claim 5, wherein:

only certain pairs of SF and N values satisfy the criterion; and

for the remaining SF and N pairs, the set of sequences comprises a subset of sequences from the set of sequences for one of the particular SF and N value pairs.

8. The method of claim 5, wherein:

when the sequence comprises a truncated Chu sequence, only certain SF and N value pairs satisfy the criterion; and

for the remaining SF and N pairs, the set of sequences comprises computer-generated sequences (CGS).

9. The method of claim 1, wherein:

assigning different sets of sequences to different sets of UEs based on at least one of: the number of UEs in the set, or the number of transmission layers.

10. The method of claim 1, further comprising signaling information about the set of sequences to the set of UEs.

11. A method of wireless communication by a User Equipment (UE), comprising:

selecting a scrambling sequence from a set of sequences designed to meet one or more criteria to achieve low cross-correlation across sequences in the set, and the set of sequences being dependent on a Spreading Factor (SF) and a number of UEs (N) in a set of UEs, including the UE; and

the transmission to the base station is scrambled using the selected scrambling sequence.

12. The method of claim 11, wherein the selected scrambling sequence allows the base station to distinguish and decode, comprising performing at least one of the following based on a different sequence in the set used to scramble the transmission: to distinguish between different UEs or to distinguish between different transport layers.

13. The method of claim 12, further comprising:

the transmission is further scrambled using a UE-specific scrambling sequence.

14. The method of claim 13, wherein each UE-specific scrambling sequence is longer than the sequences in the set of sequences.

15. The method of claim 11, wherein the one or more criteria comprise at least one of:

the sum of the squares of the cross-correlations across the sequences in the set reaches a fundamental limit; or

The individual sequence cross-correlations for each pair of sequences in the set reach a fundamental limit.

16. The method of claim 15, wherein each sequence in the set comprises: a truncated Chu sequence generated based on the SF, N, and sequence index.

17. The method of claim 15, wherein:

only certain pairs of SF and N values satisfy the criterion; and

for the remaining SF and N pairs, the set of sequences comprises a subset of sequences from the set of sequences for one of the particular SF and N value pairs.

18. The method of claim 15, wherein:

when the sequence comprises a truncated Chu sequence, only certain SF and N value pairs satisfy the criterion; and

for the remaining SF and N pairs, the set of sequences comprises computer-generated sequences (CGS).

19. The method of claim 11, further comprising:

receiving information about the set of sequences signaled to the set of UEs; and

using the information to perform at least one of: selecting or generating the scrambling sequence.

20. The method of claim 11, further comprising signaling information about the set of sequences to the base station.

21. An apparatus for wireless communications by a Base Station (BS), comprising:

means for assigning a set of sequences to a set of User Equipments (UEs), wherein the set of sequences is designed to satisfy one or more criteria to achieve low cross-correlation across sequences in the set, and the set of sequences is dependent on a Spreading Factor (SF) and a number of UEs (N);

means for receiving a signal comprising transmissions from one or more UEs in the set of UEs, wherein each transmission from a UE is scrambled using one of the sequences in the set as a scrambling sequence;

means for determining the scrambling sequence for each transmission; and

means for decoding each transmission based on the determined scrambling sequence.

22. An apparatus for wireless communications by a User Equipment (UE), comprising:

means for selecting a scrambling sequence from a set of sequences, the set of sequences being designed to satisfy one or more criteria to achieve low cross-correlation across sequences in the set, and the set of sequences being dependent on a Spreading Factor (SF) and a number of UEs (N) in a set of UEs, including the UE; and

means for scrambling transmissions to the base station using the selected scrambling sequence.

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 (e.g., bandwidth, transmit power). Examples of such multiple-access techniques include Long Term Evolution (LTE) systems, 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.

In some examples, a wireless multiple-access communication system may include several base stations, each supporting communication for multiple communication devices (otherwise referred to as User Equipments (UEs)) simultaneously. In an LTE or LTE-a network, a set of one or more base stations may define an evolved node B (eNB). In other examples (e.g., in a next generation or 5 th generation (5G) network), a wireless multiple-access communication system may include a number of Distributed Units (DUs) (e.g., Edge Units (EUs), Edge Nodes (ENs), Radio Heads (RHs), intelligent radio heads (SRHs), Transmission Reception Points (TRPs), etc.) in communication with a number of Central Units (CUs) (e.g., Central Nodes (CNs), Access Node Controllers (ANCs), etc.), wherein a set including one or more distributed units in communication with a central unit may define an access node (e.g., a new radio base station (NR BS), a new radio B node (NR NB), a network node, a 5G NB, an eNB, etc.). A base station or DU may communicate with a group of UEs on downlink channels (e.g., for transmissions from or to the base station) and uplink channels (e.g., for transmissions from the UEs to the base station or distributed unit).

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 of an emerging telecommunications standard is New Radio (NR), e.g., 5G radio access. NR is an enhanced set of LTE mobile standards promulgated by the third generation partnership project (3 GPP). It is designed to better support mobile broadband internet access by improving spectral efficiency, reducing costs, improving services, utilizing new spectrum, and better integrating with other open standards using OFDMA with Cyclic Prefix (CP) on Downlink (DL) and Uplink (UL), and to support beamforming, Multiple Input Multiple Output (MIMO) antenna techniques, and carrier aggregation.

However, as the demand for mobile broadband access continues to grow, there is a desire for further improvements in NR technology. Preferably, these improvements should be applicable to other multiple access techniques and telecommunications standards employing these techniques.

SUMMARY

The systems, methods, and devices of the present disclosure each have several aspects, no single one of which is solely responsible for its desirable attributes. Without limiting the scope of the present disclosure as expressed by the claims which follow, some features will now be discussed briefly. After considering this discussion, and particularly after reading the section entitled "detailed description" one will understand how the features of this disclosure provide advantages that include improved communications between access points and stations in a wireless network.

Certain aspects of the present disclosure provide a method for wireless communications by a User Equipment (UE). The method generally includes: the method includes selecting a scrambling sequence from a set of sequences designed to satisfy one or more criteria to achieve low cross-correlation across sequences in the set, and the set of sequences being dependent on a Spreading Factor (SF) and a number of UEs (N) in a set of UEs including the UE, and scrambling transmissions to a base station using the selected scrambling sequence.

Certain aspects of the present disclosure provide a method for wireless communications by a Base Station (BS). The method generally includes: assigning a set of sequences to a set of User Equipments (UEs), wherein the set of sequences is designed to meet one or more criteria to achieve low cross-correlation across sequences in the set and the set of sequences is dependent on a Spreading Factor (SF) and a number of UEs (N), receiving a signal comprising a transmission from one or more UEs in the set of UEs, wherein each transmission from a UE is scrambled using one of the sequences in the set as a scrambling sequence, determining the scrambling sequence for each transmission, and decoding each transmission based on the determined scrambling sequence.

Aspects generally include methods, apparatuses, systems, computer-readable media, and processing systems substantially as described herein with reference to and as illustrated by the accompanying figures.

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.