WO2020164036A1

WO2020164036A1 - Methods and apparatus of interruption at srs antenna switching in new radio system

Info

Publication number: WO2020164036A1
Application number: PCT/CN2019/075034
Authority: WO
Inventors: Zhixun Tang; Tsang-Wei Yu
Original assignee: Mediatek Singapore Pte. Ltd.
Priority date: 2019-02-14
Filing date: 2019-02-14
Publication date: 2020-08-20

Abstract

This invention proposes a mechanism of processing SRS antenna switching in a wireless communication network. The method could include a SRS antenna switching impact table/signaling for each band combination which will check whether the configured SRS transmission for antenna switching will impact other carriers in other bands. The method also includes a scheduling searching to check whether SSB receiving in other band (s) happen at the same time. The method will decide how many slots UE will interrupt for each carriers DL/UL based on a searching table or UE's capability signaling or real decision system based on the numerology of victim carrier (s) and aggressor carrier.

Description

METHODS AND APPARATUS OF INTERRUPTION AT SRS ANTENNA SWITCHING IN NEW RADIO SYSTEM

TECHNICAL FIELD

The present disclosure relates to wireless communications, and particularly relates to SRS antenna switching processing in a New Radio system.

BACKGROUND

The background description provided herein is for the purpose of generally presenting the context of the disclosure. Work of the presently named inventors, to the extent the work is described in this background section, as well as aspects of the description that may not otherwise qualify as prior art at the time of filing, are neither expressly nor impliedly admitted as prior art against the present disclosure.

The 5G New Radio (NR) system is designed to transmit SRS in the last several symbols in one slot. The SRS transmission could be used as antenna switching for acquire full DL channel information at gNB through channel reciprocity when the UE has fewer transmitting chains than receiving chains. The SRS transmission in one carrier will possible impact other carriers’ transmission/receiving process based on the RF design in each band combination.

The 5G New Radio (NR) system is designed to make use of SSB (Synchronization Signal Block) to execute the cell identification, measurement and beam management etc. . Considering the importance for SSB receiving in DL, there is collision rule for UE to handle when antenna switching SRS transmission colliding with SSB. The SSB is periodical transmission based on its SMTC (SSB Based RRM Measurement Timing Configuration) periodicity. SMTC periodicity is one of the values among {5, 10, 20, 40, 80, 160} ms.

Accordingly, it is important for the UE to properly handle the SRS transmission with antenna switching base on above configuration.

SUMMARY

Aspects of the disclosure provide a method for process SRS antenna switching procedure in a wireless communication network. The method could include a SRS antenna switching impact table/signaling for each band combination which will check whether the configured SRS transmission for antenna switching will impact other carriers in other bands. The method also includes a scheduling searching to check whether SSB receiving happens at the same time. The method will decide how many slots UE will interrupt for each carriers DL/UL based on a searching table or UE’s capability signaling or real decision system based on the numerology of victim carrier (s) and aggressor carrier.

BRIEF DESCRIPTION OF THE DRAWINGS

Various embodiments of this disclosure that are proposed as examples will be described in detail with reference to the following figures, wherein like numerals reference like elements, and wherein:

Fig. 1 shows a wireless communication system according to an embodiment of the disclosure;

Fig. 2 shows an example of UE process procedure when receiving configured SRS antenna switching according to an embodiment of the disclosure;

Fig. 3 to Fig. 10 show different examples of interruption slots for different numerology according to embodiments of the disclosure;

Fig. 11 shows an exemplary block diagram of a user equipment (UE) according to an embodiment of the disclosure.

DETAILED DESCRIPTION OF EMBODIMENTS

Fig. 1 shows a wireless communication system 100 according to an embodiment of the disclosure. The system 100 can include a user equipment (UE) 110 and a base station (BS) 120. The system 100 can be a cellular network, and employ the New Radio (NR) technologies and the LTE technologies developed by the 3rd Generation Partnership Project (3GPP) for wireless communications between the UE 110 and the BS 120. The UE 110 can be a mobile phone, a laptop computer, a device carried in a vehicle, and the like. The BS 120 can be an implementation of a gNB specified in NR standards. Accordingly, the UE 110 can communicate with the base station 120 through a wireless communication channel according to communication protocols specified in respective communication standards. Please note that the invention is not limited by this.

In one example, the UE 110 and the base station 120 are configured to employ carrier aggregation (CA) or dual-connection (DC) techniques to enhance UE’s throughput. UE could support multiple bands such as 130, 140, 150. Accordingly, band A 130 can be configured between the UE 110 and the base station 120. UE can deploy multiple carriers 131-133 in band #A130. At the same time, UE can also deploy multiple carriers 141-143, 151-153 in band #B 140 to band #K 150 based on UE’s capability.

Fig. 2 shows an example of UE process procedure 200 when receiving configured SRS antenna switching. In step 210, UE receives the higher layer (e.g., RRC) signaling to configure SRS transmission with antenna switching command in carrier #0. In step 220, UE checks whether SRS antenna switching in carrier #0 band #Awill impact other bands’ DL/UL based on UE capability. If not, in step 230, the carrier in band #i will not be affected. It will process its DL/UL signals normally. If yes, in step 240, the UE will check whether at least one carrier in band #i will receive SSB at the same time with SRS antenna switching in carrier #0 band #0. If yes, in step 250, the UE will drop the SRS antenna switching at this slot.

Alternatively, in step 250, the UE will only drop the SRS symbols which collide with SSB and transmit other SRS symbols.

In step 260, the UE will check other collision rules for SRS transmission. If other collision rules are met, for example, SRS transmission has lower priority than other signals’ process, in step 270, the UE will drop the SRS antenna switching at this slot.

In step 280, the UE will check whether all processing bands are finished. If not, the UE will continue the process from step 220.

If yes, in step 290, the UE will decide how many slots will be interrupted in carrier #j band #i based on the numerology, UL TA number, CA or DC, synchronization or asynchronization DC etc. parameters.

In step 2100, the UE will stop the DL or/and UL processing for interrupted slots in carrier #j in band #i.

In step 2110, the UE will transmit SRS with antenna switching in carrier #0 band #Abased on the configured time slot/symbols. According to different design requirement, this step may be proceeded after step 290 or step 2100.

Fig. 3 shows an example 300 of victim cells for different numerology with aggressor cell’s sub-carrier spacing (SCS) =15khz. The SRS antenna switching process time 310 includes 2*Tx/Rx antenna switching time plus the SRS transmission time in the aggressor cell. The interruption length starting from slot #n but end in slot #n+1.

In one embodiment, the victim cell SCS=15khz, the interrupted slot will be slot #n and slot #n+1. In another embodiment, the victim cell SCS=30khz, the interrupted slot will be slot #n+1, and slot #n+2. In another embodiment, the victim cell SCS=60khz, the interrupted slot will be slot #n+2, slot #n+3 and slot #n+4. In yet another embodiment, the victim cell SCS=120khz, the interrupted slot will be from slot #n+4 to slot #n+8.

Alternatively, the UE will have the same interrupted slots number in victim cell (s) for aggressor cell with SCS=15khz in DC scenario.

Alternatively, the victim cell which is not in the same frequency range with aggressor cell will have no interruption when UE supports per-FR gap capability.

Fig. 4 shows an example 400 of victim cells for different numerology with aggressor cell’s sub-carrier spacing (SCS) =15khz and uplink (UL) time advance (TA) in aggressor cell. The SRS antenna switching process time 410 includes 2*Tx/Rx antenna switching time plus the SRS transmission time in aggressor cell. The interruption length starting from slot #n and end in slot #n because of UL TA.

In one embodiment, the victim cell SCS=15khz, the interrupted slot will be slot #n. In another embodiment, the victim cell SCS=30khz, the interrupted slot will be slot #n+1. In another embodiment, the victim cell SCS=60khz, the interrupted slot will be slot #n+2, slot #n+3. In yet another embodiment , the victim cell SCS=120khz, the interrupted slot will be from slot #n+4 to slot #n+7.

Alternatively, the UE will have the same interrupted slots number in victim cell (s) for aggressor cell with SCS=15khz in asynchronization DC scenario.

Fig. 5 shows a CA example 500 of victim cells for different numerology with aggressor cell’s sub-carrier spacing (SCS) =30khz. The SRS antenna switching process time 510 includes 2*Tx/Rx antenna switching time plus the SRS transmission time in aggressor cell. The interruption length starting from slot #n+1 but end in slot #n+2.

In one embodiment, the victim cell SCS=15khz, the interrupted slot will be slot #n and slot #n+1. In another embodiment, the victim cell SCS=30khz, the interrupted slot will be slot #n+1, and slot #n+2. In another embodiment, the victim cell SCS=60khz, the interrupted slot will be slot #n+3 and slot #n+4. In yet another embodiment, the victim cell SCS=120khz, the interrupted slot will be from slot #n+6, to slot #n+8.

Alternatively, the UE will have the same interrupted slots number in victim cell (s) for aggressor cell with SCS=30khz in DC scenario.

Fig. 6 shows an example 600 of victim cells for different numerology with aggressor cell’s sub-carrier spacing (SCS) =30khz and uplink (UL) time advance (TA) in aggressor cell. The SRS antenna switching process time 610 includes 2*Tx/Rx antenna switching time plus the SRS transmission time in aggressor cell. The interruption length starting from slot #n+1 and end in slot #n+1 because of UL TA.

In one embodiment, the victim cell SCS=15khz, the interrupted slot will be slot #n. In another embodiment, the victim cell SCS=30khz, the interrupted slot will be slot #n+1. In another embodiment, the victim cell SCS=60khz, the interrupted slot will be slot #n+2, slot #n+3. In yet another embodiment, the victim cell SCS=120khz, the interrupted slot will be from slot #n+5 to slot #n+7.

Alternatively, the UE will have the same interrupted slots number in victim cell (s) for aggressor cell with SCS=30khz in asynchronization DC scenario.

Fig. 7 shows a CA example 700 of victim cells for different numerology with aggressor cell’s sub-carrier spacing (SCS) =60khz. The SRS antenna switching process time 710 includes 2*Tx/Rx antenna switching time plus the SRS transmission time in aggressor cell. The interruption length starting from slot #n+3 but end in slot #n+4.

In one embodiment, the victim cell SCS=15khz, the interrupted slot will be slot #n and slot #n+1. In another embodiment, the victim cell SCS=30khz, the interrupted slot will be slot #n+1, and slot #n+2. In another embodiment, the victim cell SCS=60khz, the interrupted slot will be slot #n+3 and slot #n+4. In yet another embodiment, the victim cell SCS=120khz, the interrupted slot will be slot #n+7, and slot #n+8.

Alternatively, the UE will have the same interrupted slots number in victim cell (s) for aggressor cell with SCS=60khz in DC scenario.

Fig. 8 shows an example 800 of victim cells for different numerology with aggressor cell’s sub-carrier spacing (SCS) =60khz and uplink (UL) time advance (TA) in aggressor cell. The SRS antenna switching process time 810 includes 2*Tx/Rx antenna switching time plus the SRS transmission time in aggressor cell. The interruption length starting from slot #n+3 and end in slot #n+3 because of UL TA.

In one embodiment, the victim cell SCS=15khz, the interrupted slot will be slot #n. In another embodiment, the victim cell SCS=30khz, the interrupted slot will be slot #n+1. In another embodiment, the victim cell SCS=60khz, the interrupted slot will be slot #n+3. In yet another embodiment, the victim cell SCS=120khz, the interrupted slot will be slot #n+6, and slot #n+7.

Alternatively, the UE will have the same interrupted slots number in victim cell (s) for aggressor cell with SCS=60khz in asynchronization DC scenario.

Fig. 9 shows a CA example 900 of victim cells for different numerology with aggressor cell’s sub-carrier spacing (SCS) =120khz. The SRS antenna switching process time 910 includes 2*Tx/Rx antenna switching time plus the SRS transmission time in aggressor cell. The interruption length starting from slot #n+7 but end in slot #n+8.

Alternatively, the UE will have the same interrupted slots number in victim cell (s) for aggressor cell with SCS=120khz in DC scenario.

Fig. 10 shows an example 1000 of victim cells for different numerology with aggressor cell’s sub-carrier spacing (SCS) =120khz and uplink (UL) time advance (TA) in aggressor cell. The SRS antenna switching process time 1010 includes 2*Tx/Rx antenna switching time plus the SRS transmission time in aggressor cell. The interruption length starting from slot #n+7 and end in slot #n+7 because of UL TA.

Alternatively, the UE will have the same interrupted slots number in victim cell (s) for aggressor cell with SCS=120khz in asynchronization DC scenario.

Please note that based on different numerology/UE design, the interrupted slots may be different from the embodiments illustrated above.

Fig. 11 shows an exemplary block diagram of a UE 1100 according to an embodiment of the disclosure. The UE 1100 can be configured to implement various embodiments of the disclosure described herein. The UE 1100 can include a processor 1110, a memory 1120, and a radio frequency (RF) module 1130 that are coupled together as shown in Fig. 11. In different examples, the UE 1100 can be a mobile phone, a tablet computer, a desktop computer, a vehicle carried device, and the like.

The processor 1110 can be configured to perform various functions of the UE 120 described above with reference to Figs. 1-10. The processor 1110 can include signal processing circuitry to process received or to be transmitted data according to communication protocols specified in, for example, LTE and NR standards. Additionally, the processor 1110 may execute program instructions, for example, stored in the memory 1120, to perform functions related with different communication protocols. The processor 1110 can be implemented with suitable hardware, software, or a combination thereof. For example, the processor 1110 can be implemented with application specific integrated circuits (ASIC) , field programmable gate arrays (FPGA) , and the like, that includes circuitry. The circuitry can be configured to perform various functions of the processor 1110.

In one example, the memory 1120 can store program instructions that, when executed by the processor 1110, cause the processor 1110 to perform various functions as described herein. The memory 1120 can include a read only memory (ROM) , a random access memory (RAM) , a flash memory, a solid state memory, a hard disk drive, and the like.

The RF module 1130 can be configured to receive a digital signal from the processor 1110 and accordingly transmit a signal to a base station in a wireless communication network via an antenna 1140. In addition, the RF module 1130 can be configured to receive a wireless signal from a base station and accordingly generate a digital signal which is provided to the processor 1110. The RF module 1130 can include digital to analog/analog to digital converters (DAC/ADC) , frequency down/up converters, filters, and amplifiers for reception and transmission operations. For example, the RF module 1130 can include converter circuits, filter circuits, amplification circuits, and the like, for processing signals on different carriers or bandwidth parts.

The UE 1100 can optionally include other components, such as input and output devices, additional CPU or signal processing circuitry, and the like. Accordingly, the UE 1100 may be capable of performing other additional functions, such as executing application programs, and processing alternative communication protocols.

The processes and functions described herein can be implemented as a computer program which, when executed by one or more processors, can cause the one or more processors to perform the respective processes and functions. The computer program may be stored or distributed on a suitable medium, such as an optical storage medium or a solid-state medium supplied together with, or as part of, other hardware. The computer program may also be distributed in other forms, such as via the Internet or other wired or wireless telecommunication systems. For example, the computer program can be obtained and loaded into an apparatus, including obtaining the computer program through physical medium or distributed system, including, for example, from a server connected to the Internet.

The computer program may be accessible from a computer-readable medium providing program instructions for use by or in connection with a computer or any instruction execution system. A computer readable medium may include any apparatus that stores, communicates, propagates, or transports the computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer-readable medium can be magnetic, optical, electronic, electromagnetic, infrared, or semiconductor system (or apparatus or device) or a propagation medium. The computer-readable medium may include a computer-readable non-transitory storage medium such as a semiconductor or solid state memory, magnetic tape, a removable computer diskette, a random access memory (RAM) , a read-only memory (ROM) , a magnetic disk and an optical disk, and the like. The computer-readable non-transitory storage medium can include all types of computer readable medium, including magnetic storage medium, optical storage medium, flash medium and solid state storage medium.

While aspects of the present disclosure have been described in conjunction with the specific embodiments thereof that are proposed as examples, alternatives, modifications, and variations to the examples may be made. Accordingly, embodiments as set forth herein are intended to be illustrative and not limiting. There are changes that may be made without departing from the scope of the claims set forth below.

Claims

A method, comprising:

receiving SRS antenna switching impact table/signalling for each band combination which will check whether the configured SRS transmission for antenna switching will impact other carriers in other bands;

scheduling searching to check whether SSB receiving happens at the same time; and

deciding how many slots UE will interrupt for each carriers DL/UL based on a searching table or UE’s capability signaling or real decision system for the combination about the numerology and interruption slots.
The method of claim 1, further comprising:

deciding drop SRS transmission mechanism by detect the collision with SSB receiving at the same time in the carrier (s) which will be impacted by SRS transmission carrier.
The method of claim 2, further comprising:

scheduling the victim carrier (s) which impacted by the SRS transmission aggressor carrier.
The method of claim 1, further comprising:

interrupting victim carrier (s) based on the numerology of victim carrier (s) and aggressor carrier.
The method of claim 3, further comprising:

When the UE is in CA or DC deployment, and the aggressor carrier with SRS transmission’s SCS is 15KHz;

The victim carrier (s) of SCS=15KHz will interrupt 2 slots;

The victim carrier (s) of SCS=30KHz will interrupt 2 slots;

The victim carrier (s) of SCS=60KHz will interrupt 3 slots;

The victim carrier (s) of SCS=120KHz will interrupt 5 slots.
The method of claim 3, further comprising:

When the UE is in CA with UL TA or DC deployment with UL TA or asynchronization DC, and the aggressor carrier with SRS transmission’s SCS is 15KHz;

When SRS transmission length and RF retuning length all base on one aggressor carrier slot,

The victim carrier (s) of SCS=15KHz will interrupt 1 slots;

The victim carrier (s) of SCS=30KHz will interrupt 1 slots;

The victim carrier (s) of SCS=60KHz will interrupt 2 slots;

The victim carrier (s) of SCS=120KHz will interrupt 4 slots.
The method of claim 3, further comprising:

When the UE is in CA or DC deployment, and the aggressor carrier with SRS transmission’s SCS is 30KHz;

The victim carrier (s) of SCS=15KHz will interrupt 2 slots;

The victim carrier (s) of SCS=30KHz will interrupt 2 slots;

The victim carrier (s) of SCS=60KHz will interrupt 2 slots;

The victim carrier (s) of SCS=120KHz will interrupt 3 slots.
The method of claim 3, further comprising:

When the UE is in CA with UL TA or DC deployment with UL TA or asynchronization DC, and the aggressor carrier with SRS transmission’s SCS is 30KHz;

When SRS transmission length and RF retuning length all base on one aggressor carrier slot,

The victim carrier (s) of SCS=15KHz will interrupt 1 slots;

The victim carrier (s) of SCS=30KHz will interrupt 1 slots;

The victim carrier (s) of SCS=60KHz will interrupt 2 slots;

The victim carrier (s) of SCS=120KHz will interrupt 3 slots.
The method of claim 3, further comprising:

When the UE is in CA or DC deployment, and the aggressor carrier with SRS transmission’s SCS is 60KHz;

The victim carrier (s) of SCS=15KHz will interrupt 2 slots;

The victim carrier (s) of SCS=30KHz will interrupt 2 slots;

The victim carrier (s) of SCS=60KHz will interrupt 2 slots;

The victim carrier (s) of SCS=120KHz will interrupt 2 slots.
The method of claim 3, further comprising:

When the UE is in CA with UL TA or DC deployment with UL TA or asynchronization DC, and the aggressor carrier with SRS transmission’s SCS is 60KHz;

When SRS transmission length and RF retuning length all base on one aggressor carrier slot,

The victim carrier (s) of SCS=15KHz will interrupt 1 slots;

The victim carrier (s) of SCS=30KHz will interrupt 1 slots;

The victim carrier (s) of SCS=60KHz will interrupt 1 slots;

The victim carrier (s) of SCS=120KHz will interrupt 2 slots.
The method of claim 3, further comprising:

When the UE is in CA or DC deployment, and the aggressor carrier with SRS transmission’s SCS is 120KHz;

The victim carrier (s) of SCS=15KHz will interrupt 2 slots;

The victim carrier (s) of SCS=30KHz will interrupt 2 slots;

The victim carrier (s) of SCS=60KHz will interrupt 2 slots;

The victim carrier (s) of SCS=120KHz will interrupt 2 slots.
The method of claim 3, further comprising:

When the UE is in CA with UL TA or DC deployment with UL TA or asynchronization DC, and the aggressor carrier with SRS transmission’s SCS is 120KHz;

When SRS transmission length and RF retuning length all base on one aggressor carrier slot,

The victim carrier (s) of SCS=15KHz will interrupt 1 slots;

The victim carrier (s) of SCS=30KHz will interrupt 1 slots;

The victim carrier (s) of SCS=60KHz will interrupt 1 slots;

The victim carrier (s) of SCS=120KHz will interrupt 1 slots.
The method of claim 3, further comprising:

When UE support per-FR gap, the interruption on the SRS transmission with antenna switching in the victim cell (s) will only be caused by the aggressor cell in the same FR.