CN114503476B

CN114503476B - Information sending method and device, terminal, access network equipment and system

Info

Publication number: CN114503476B
Application number: CN201980099523.7A
Authority: CN
Inventors: 石聪; 付喆
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2019-10-18
Filing date: 2019-10-18
Publication date: 2023-12-05
Anticipated expiration: 2039-10-18
Also published as: CN114503476A; WO2021072739A1

Abstract

A method and User Equipment (UE) for retransmission are provided. In the method, a UE receives an Uplink (UL) grant for retransmission from a gndeb (gNB), and the UE determines whether to ignore the UL grant.

Description

Information sending method and device, terminal, access network equipment and system

Technical Field

The present disclosure relates to the field of communications, and more particularly, to a method and User Equipment (UE) for retransmission.

Background

At the RANs Chongqing conference of RAN2#107bis, the following agreements are made:

chairman summary:

every person considers (according to previous protocols) that the gcb scheduling retransmissions of the de-prioritized transmission should be supported.

Allowing "UE automatic retransmission in uplink grant (CG) resources" to be strongly supported. For this case, the MAC (multiple access channel) will not regenerate the PDU (packet data unit), but whether the transmission is considered a HARQ (hybrid automatic repeat request) new transmission or whether the HARQ retransmission is pending.

No consensus is reached for additional effort to speed up retransmissions by using another HARQ process, if needed.

It seems unclear whether a new air interface (NR-U) solution in the unlicensed spectrum can be reused.

Disclosure of Invention

In a first aspect, there is provided a method for retransmission, comprising: a User Equipment (UE) receives an Uplink (UL) grant for retransmission from a gndeb (gNB); and the UE determining whether to ignore the UL grant.

In one embodiment, the UE determining whether to ignore the UL grant comprises: if a UL grant received on a Physical Downlink Control Channel (PDCCH) is addressed to a configuration scheduling radio network temporary identity (CS-RNTI), and if a hybrid automatic repeat request (HARQ) buffer of an identified procedure is empty due to a collision between UL transmissions of CG resources and other UL transmissions, the UE determines to cancel the priority of the transmission of CG resources.

In one embodiment, the UE determining whether to ignore the UL grant comprises: if a UL grant received on a Physical Downlink Control Channel (PDCCH) is addressed to a configuration scheduling radio network temporary identity (CS-RNTI), and if a hybrid automatic repeat request (HARQ) buffer of an identified procedure is empty due to no data being available for CG resources colliding with other UL transmissions, the UE does not ignore the UL grant.

In a second aspect, there is provided a User Equipment (UE) for retransmission, comprising: a transceiver configured to receive an Uplink (UL) grant for retransmission from a gndeb (gNB); and at least one processor configured to determine whether to ignore the UL grant.

In one embodiment, if a UL grant received on a Physical Downlink Control Channel (PDCCH) is addressed to a configuration scheduling radio network temporary identity (CS-RNTI) and if a hybrid automatic repeat request (HARQ) buffer of an identified procedure is empty due to a collision between UL transmissions of CG resources and other UL transmissions, then a determination is made to cancel the transmission of CG resources.

In one embodiment, the processor is configured to: if a UL grant received on a Physical Downlink Control Channel (PDCCH) is addressed to a configuration scheduling radio network temporary identity (CS-RNTI) and if a hybrid automatic repeat request (HARQ) buffer for the identified procedure is empty due to no data being available for CG resources colliding with other UL transmissions, the UL grant is not ignored.

Drawings

In order to more clearly describe the technical solutions in the embodiments of the present disclosure, the drawings that are needed in the description about the embodiments will be briefly introduced below. It is apparent that the drawings in the following description are only some embodiments of the present disclosure. Other figures may be further derived from these figures by a person of ordinary skill in the art without the inventive work.

Fig. 1 is a schematic block diagram of a mobile communication system according to an exemplary embodiment of the present disclosure.

Fig. 2 is a flowchart illustrating a method for retransmission according to an embodiment of the present disclosure.

Fig. 3 is a schematic block diagram of a UE according to an embodiment of the present disclosure.

Fig. 4 is a schematic block diagram of a network device according to an embodiment of the present disclosure.

Fig. 5 is a schematic block diagram of a UE according to an exemplary embodiment of the present disclosure.

Fig. 6 is a schematic block diagram of a network device according to an exemplary embodiment of the present disclosure.

Detailed Description

In order to make the objects, technical solutions and advantages of the present disclosure more apparent, an implementation of the present disclosure will be described in further detail with reference to the accompanying drawings.

Reference herein to "a module" generally refers to a program or instruction stored in a memory capable of performing certain functions. Reference herein to "a unit" generally refers to a logically divided functional structure. The "unit" may be implemented by pure hardware or a combination of hardware and software.

The term "plurality" as used herein means two or more. The term "and/or" is an association describing an associated object, meaning that there may be three relationships. For example, a and/or B may represent: a is present alone, A and B are present simultaneously, and B is present alone. The character "/" generally indicates that the context object is an "or" relationship. The terms "first," "second," and the like in the description and in the claims, are not used for any order, quantity, or importance, but are used for distinguishing between different components.

Referring to fig. 1, fig. 1 shows a schematic block diagram of a mobile communication system according to an embodiment of the present disclosure. The mobile communication system may be a 5G (fifth generation) system, also referred to as an NR (New Radio) system. The mobile communication system includes access network device 120 and terminal 140.

Access network device 120 may be a base station. For example, the base station may be a base station (gNB) employing a central distributed architecture in a 5G system. When access network device 120 employs a central distributed architecture, it typically includes a Central Unit (CU) and at least two Distributed Units (DUs). The CU is provided with protocol stacks of a Packet Data Convergence Protocol (PDCP) layer, a Radio Link Control (RLC) layer, and a Medium Access Control (MAC) layer. The DUs are provided with a Physical (PHY) layer protocol stack. The specific implementation of access network device 120 in embodiments of the present disclosure is not so limited. Optionally, the access network device may also include home enbs (henbs), relays, pico (pico), etc.

Access network device 120 and terminal 140 establish a wireless connection over the air. Optionally, the radio is a fifth generation mobile communication network technology (5G) standard based radio. For example, wireless NR is NR; or the radio may also be a radio based on the technical standard of the next generation mobile communication network of 5G.

Terminal 140 may be a device that provides voice and/or data connectivity to a user. A terminal may communicate with one or more core networks through a Radio Access Network (RAN). For example, the terminal 140 may be a mobile terminal, such as a mobile telephone (or "cellular" telephone) and a computer having a mobile terminal. For example, the terminal may also be a portable, pocket, hand-held, computer integrated or vehicle-mounted mobile device. For example, it is a subscriber unit, subscriber station, mobile telephone, remote station, access point, remote terminal, access terminal, user agent, user device, or user equipment.

It should be noted that in the mobile communication system shown in fig. 1, a plurality of access network devices 120 and/or a plurality of terminals 140 may be included. One access network device 120 and one terminal 140 shown in fig. 1 are taken as examples, but the present embodiment is not limited thereto.

chairman summary:

Allowing "UE automatic retransmission in CG resources" to be strongly supported. For this case, the MAC will not regenerate the PDU, but whether the transmission is considered a HARQ new transmission or whether the HARQ retransmission is pending.

No consensus is reached for making additional effort to accelerate retransmissions by using another HARQ process if needed.

It seems unclear whether the NR-U solution can be reused.

Support with "UE automatic retransmission in CG resources". Allowing the complexity of the next meeting to be checked.

Regarding the first point of chairman summary, the gNB scheduling retransmission of a de-prioritized UL transmission should be supported, which means that when the UE determines to de-prioritize the transmission due to collision of the transmission with another UL transmission, the UE may rely on the retransmission schedule from the gNB for the de-prioritized UL transmission. If the UE has generated a MAC PDU for a de-prioritized UL transmission, there may be a corresponding MAC PDU stored in the HARQ buffer.

Regarding the second point of chairman summary, it seems most of the insight that if a MAC PDU is de-prioritized when a CG collides with another UL transmission with a higher priority, the UE will perform an automatic retransmission in the CG resource. In our understanding, automatic retransmission means that if a generated de-prioritized MAC PDU is stored in a HARQ buffer with HARQ process id#n, the UE can transmit the stored de-prioritized MAC PDU using the next CG resource with the same HARQ process id#n.

Problems:

the gNB does not know whether or not a de-prioritized MAC PDU was generated, as it is done at the UE side. Then, when the ue receives a retransmission grant (according to bullets # 1) from the gNB, the HARQ buffer may be empty. In this case, according to the legacy behavior in the current MAC specification (5.4.2.1HARQ entity), the UE simply ignores UL grants for retransmission, as shown below:

2> otherwise (i.e., retransmission):

3> if the uplink grant received on the PDCCH is addressed to the CS-RNTI and if the HARQ buffer of the identified procedure is empty; or alternatively

3> if the uplink grant is part of a bundle (bundle) and if no MAC PDU for this bundle is obtained; or alternatively

3> if the uplink grant is part of a bundle of configured uplink grants and the PUSCH of the uplink grant overlaps with the PUSCH of another uplink grant received on the PDCCH or in the random access response of the serving cell:

4> ignores the uplink grant.

The problem is that if the UE always ignores the retransmission grant when the HARQ buffer is empty because the UE does not generate a de-prioritized MAC PDU or no data is available for CG, there may be additional delay/resource waste when there is available new data in the LCH that should be sent as soon as possible, and the available data may be allowed to be sent in the received UL grant for retransmission.

The solution is as follows:

the solution is as follows:

1. when the UE receives an uplink grant for retransmission, this means that the NDI is not switched and the RVI is set to a specific value by the gNB;

2. if the UL grant received on the PDCCH is addressed to the CS-RNTI and the HARQ buffer of the identified procedure is empty due to collision between UL transmissions of CG resources and other UL transmissions, the UE is determined to cancel the priority of CG transmissions; or,

3. if the UL grant received on the PDCCH is addressed to the CS-RNTI and if the HARQ buffer for the identified procedure is empty due to no data being available for CG resources that collide with other UL transmissions:

the UE does not ignore the UL grant;

4. if the UE does not ignore the UL grant due to the satisfaction of the above condition, and the UE does not generate a de-prioritized MAC PDU for CG resources:

a. if so, obtaining the MAC PDU to be sent from the multiplexing and assembling entity;

5. if the UE does not ignore the UL grant due to the satisfaction of the above condition and the UE has generated a de-prioritized MAC PDU for CG resources:

a. obtaining a de-prioritized MAC PDU from the corresponding HARQ process;

6. if a MAC PDU to be transmitted is obtained according to 4 or 5:

a. transmitting the MAC PDU and the retransmission uplink grant and the HARQ information of the TB to the identified HARQ process;

b. indicating that the identified HARQ process triggers transmission;

c. if the uplink grant is addressed to CS-RNTI; or alternatively

d. If the uplink grant is a configured uplink grant; or alternatively

e. If the uplink grant is addressed to the C-RNTI and the identified HARQ process is configured for the configured uplink grant:

i. then the configuration grant timer (configurable grant timer) is started or restarted for the corresponding HARQ process when the transmission is performed.

7. Otherwise (meaning that there is no available data to be transmitted):

a. the UE ignores the UL grant;

8. triggering a transmission with respect to "indicating the identified HARQ process; ", which may be:

a. new transmission, or

b. And (5) retransmitting.

In S202, the UE receives an uplink grant (UL) for retransmission from the gndeb (gNB).

In S204, the UE determines whether to ignore the UL grant.

The following are device embodiments of the present disclosure. For components not detailed in the device embodiments, reference may be made to the technical details disclosed in the foregoing method embodiments.

Referring to fig. 3, a schematic block diagram of a UE according to an embodiment of the present disclosure is shown. The UE may include a processing unit 301, a receiving unit 302, and a transmitting unit 303.

The processing unit 301 is configured to perform the above-described steps and at least one further function of the determining step or the calculating step.

The receiving unit 302 is configured to perform the functions of at least one receiving step, explicit or implicit in the method embodiment described above.

The transmission unit 303 is configured to perform the functions of the steps related to transmission in the above-described embodiment.

Referring to fig. 4, a schematic block diagram of a network device according to an embodiment of the present disclosure is shown. The network device may include a processing unit 401, a transmitting unit 402, and a receiving unit 403.

The processing unit 401 is configured to perform the function of explicit or implicit determination or calculation steps.

The transmitting unit 402 is configured to perform the function of at least one explicit or implicit transmitting step in the above-described method embodiments.

The receiving unit 403 is configured to perform the function of explicit or implicit receiving steps.

Referring to fig. 5, a schematic block diagram of a UE according to an exemplary embodiment of the present disclosure is shown. The UE may include a processor 11, a receiver 12, a transmitter 13, a memory 14, and a bus 15.

The processor 11 includes one or more processing cores, and the processor 11 runs software programs and modules to execute various functional applications and information processing.

The receiver 12 and the transmitter 13 may be implemented as communication components. The communication component may be a communication chip. The communication chip may include a receiving module, a transmitting module, a modem module, etc., and is configured to modulate and/or demodulate information and receive or transmit information through a wireless signal.

The memory 14 is connected to the processor 11 via a bus 15.

The memory 14 may be configured to store software programs and modules.

The memory 14 may store application modules 16 for at least one function. The application module 16 may include a processing module 161, a receiving module 163, and a transmitting module 162.

The processor 11 is configured to execute a processing module 161 to perform the functions of the relevant determining or calculating steps in the various method embodiments. The processor 11 is configured to execute a transmission module 162 implementing the functions of the relevant transmission steps in the various method embodiments. The processor 11 is configured to execute a receiving module 163 to implement the functions of the relevant receiving steps in the various method embodiments.

Furthermore, the memory 14 may be implemented by any type or combination of volatile or non-volatile memory devices, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk, or optical disk.

Referring to fig. 6, a schematic block diagram of a network device according to an exemplary embodiment of the present disclosure is shown. The network device comprises a processor 21, a receiver 22, a transmitter 23, a memory 24 and a bus 25.

The processor 21 includes one or more processing cores, and the processor 21 runs software programs and modules to execute various functional applications and information processing.

The receiver 22 and the transmitter 23 may be implemented as communication components. The communication component may be a communication chip. The communication chip may include a receiving module, a transmitting module, a modem module, etc., and is configured to modulate and demodulate information and receive or transmit information through a wireless signal.

The memory 24 is connected to the processor 21 via a bus 25.

The memory 24 may be configured to store software programs and modules.

The memory 24 may store application modules 26 for at least one function. The application modules 26 may include a processing module 261, a sending module 262, and a receiving module 263.

The processor 21 is configured to execute a receiving module 263 implementing the functionality of the relevant receiving step in the various method embodiments. The processor 21 is configured to execute the processing module 261 to perform the functions of the relevant determining or calculating steps in the various method embodiments. The processor 21 is configured to execute a transmission module 262 implementing the functions of the relevant transmission steps in the various method embodiments.

Further, the memory 24 may be implemented by any type or combination of volatile or non-volatile storage, such as SRAM, EEPROM, EPROM, PROM, ROM, magnetic memory, flash memory, magnetic or optical disk.

Embodiments of the present disclosure also provide a system, which may include a UE and a network device.

The UE may include the information receiving device provided in fig. 4, and the network device may be the network device provided in fig. 3.

Alternatively, the UE may be the terminal provided in fig. 5, and the network device may be the access network device provided in fig. 6.

Those skilled in the art will recognize that in one or more of the above examples, the functions described in the embodiments of the present disclosure may be implemented by hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media includes any medium that is used to transfer a computer program from one place to another. Storage media may be any available media that can be accessed by a general purpose or special purpose computer.

The foregoing is merely a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, or the like, which are within the spirit and principles of the present disclosure, are intended to be within the scope of the present disclosure.

Claims

1. A method for retransmission, comprising:

a User Equipment (UE) receives an Uplink (UL) grant for retransmission from a gndeb (gNB);

the UE determining whether to ignore the UL grant;

wherein the UE does not ignore the UL grant if the UL grant received on a Physical Downlink Control Channel (PDCCH) is addressed to a configuration scheduling radio network temporary identity (CS-RNTI) and if a hybrid automatic repeat request (HARQ) buffer of the identified procedure is empty due to no data being available for CG resources conflicting with other UL transmissions; the UL grant is allowed to transmit available new data when the available new data exists in the logical channel LCH.

2. The method of claim 1, wherein the UE determining whether to ignore the UL grant comprises:

if the UL grant received on a Physical Downlink Control Channel (PDCCH) is addressed to a configuration scheduling radio network temporary identity (CS-RNTI), and if a hybrid automatic repeat request (HARQ) buffer of an identified procedure is empty due to a collision between UL transmissions of a configuration grant CG resource and other UL transmissions, the UE determines to cancel a priority of transmission of the CG resource.

3. A User Equipment (UE) for retransmission, comprising:

a transceiver configured to receive an Uplink (UL) grant for retransmission from a gndeb (gNB);

at least one processor configured to determine whether to ignore the UL grant;

4. The UE of claim 3, wherein the processor is configured to:

if the UL grant received on a Physical Downlink Control Channel (PDCCH) is addressed to a configuration scheduling radio network temporary identity (CS-RNTI) and if a hybrid automatic repeat request (HARQ) buffer of an identified procedure is empty due to a collision between UL transmissions of CG resources and other UL transmissions, a priority to cancel the transmission of the CG resources is determined.