WO2023078014A1 - Procédé et appareil de gestion d'optimisation de mémoire de fenêtre rlc de 5g nr - Google Patents

Procédé et appareil de gestion d'optimisation de mémoire de fenêtre rlc de 5g nr Download PDF

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WO2023078014A1
WO2023078014A1 PCT/CN2022/123734 CN2022123734W WO2023078014A1 WO 2023078014 A1 WO2023078014 A1 WO 2023078014A1 CN 2022123734 W CN2022123734 W CN 2022123734W WO 2023078014 A1 WO2023078014 A1 WO 2023078014A1
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memory
rlc
pointer array
pointer
downlink
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PCT/CN2022/123734
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Chinese (zh)
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郑锐
孙金重
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翱捷科技股份有限公司
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F9/00—Arrangements for program control, e.g. control units
    • G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
    • G06F9/46—Multiprogramming arrangements
    • G06F9/50—Allocation of resources, e.g. of the central processing unit [CPU]
    • G06F9/5005—Allocation of resources, e.g. of the central processing unit [CPU] to service a request
    • G06F9/5011—Allocation of resources, e.g. of the central processing unit [CPU] to service a request the resources being hardware resources other than CPUs, Servers and Terminals
    • G06F9/5016—Allocation of resources, e.g. of the central processing unit [CPU] to service a request the resources being hardware resources other than CPUs, Servers and Terminals the resource being the memory
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F12/00—Accessing, addressing or allocating within memory systems or architectures
    • G06F12/02—Addressing or allocation; Relocation
    • G06F12/0223—User address space allocation, e.g. contiguous or non contiguous base addressing
    • G06F12/023—Free address space management

Definitions

  • This application relates to a mobile communication technology, in particular to a 5G (fifth generation mobile communication technology) NR (New Radio, new wireless) RLC (Radio Link control, radio link control) memory optimization management method for uplink and downlink windows .
  • 5G fifth generation mobile communication technology
  • NR New Radio, new wireless
  • RLC Radio Link control, radio link control
  • the 5G NR RLC layer is used to receive the RLC SDU (service Data Unit, service data unit) sent by the upper layer. After processing, the RLC layer assembles it into an RLC PDU (Protocol Data Unit, protocol data unit) and delivers it to the lower layer.
  • RLC SDU Service Data Unit
  • RLC PDU Protocol Data Unit, protocol data unit
  • An important function of the 5G NR RLC layer is to provide reliable transmission for user data and control data, including retransmission and confirmation functions.
  • the RLC transmission mode is divided into: transparent mode (TM, transparent mode), unacknowledged mode (UM, unacknowledged mode), and acknowledged mode (AM, acknowledged mode).
  • TM transparent mode
  • UM unacknowledged mode
  • AM acknowledged mode
  • the confirmation mode is used to realize reliable transmission.
  • the UE (user equipment, user equipment) sends an uplink data packet to the network side, and the network side will return an uplink status report (status report) to the UE according to the actual reception of the uplink data packet.
  • the uplink status report includes ACK (acknowledgement) and NAK (negative acknowledgment) information, ACK information is used to indicate which data packets have been received, and NAK information is used to indicate which data packets have not been received.
  • the UE will retransmit the data packet receiving the NAK information according to the indication of the uplink status report.
  • the network side sends downlink data packets to the UE. Due to the quality of the air interface, packet loss may occur during the period.
  • the UE will send a downlink status report to the network side according to the actual reception of the downlink data packets, and indicate the status of the downlink data packets to the network side. Reception so that the network side retransmits lost downstream packets.
  • Both the uplink data packet and the downlink data packet are RLC PDUs.
  • the RLC uplink window of 5G NR is maintained by three parameters TX_NEXT, TX_NEXT_ACK and AM_WINDOW_SIZE in the confirmation mode.
  • TX_NEXT refers to the sequence number (SN) of the uplink RLC PDU that the UE is about to send
  • TX_NEXT_ACK refers to the sequence number of the first uplink RLC PDU that the UE has sent and is waiting for the network side to reply ACK or NAK information
  • AM_WINDOW_SIZE refers to The size of the RLC uplink window.
  • the serial number of RLC PDU in 5G NR confirmation mode is divided into 12 bits (bit) and 18 bits. For the case of a 12-bit serial number, AM_WINDOW_SIZE is 2048. For the case of an 18-bit serial number, AM_WINDOW_SIZE is 131072.
  • the RLC downlink window is mainly maintained by two parameters RX_NEXT and AM_WINDOW_SIZE.
  • RX_NEXT refers to the sequence number of the first downlink RLC PDU that the UE is waiting to receive or wait for the segment to receive the complete first downlink RLC PDU
  • AM_WINDOW_SIZE refers to the size of the RLC downlink window.
  • the network side may not receive the uplink data packet sent by the UE, which requires the UE side to save the original uplink data packet sent for retransmission.
  • the UE may not receive the downlink data packet sent by the network side, which requires the UE to record the reception of the downlink data packet in preparation for sending a status report to the network side.
  • the UE wants to send the status report of the downlink RLC PDU to the network side, it must record the sequence number of each downlink RLC PDU and its downlink reception information.
  • the downlink receiving information includes: whether the downlink RLC PDU of the current sequence number has been received; whether the downlink RLC PDU of the current sequence number has been segmented; if the downlink RLC PDU of the current sequence number has been segmented, whether the complete part has been received part.
  • the technical problem to be solved in this application is to propose a method for memory optimization management of 5G NR RLC uplink and downlink windows, so as to save system memory to the greatest extent. For this reason, this application also proposes a device for memory optimization management of 5G NR RLC uplink and downlink windows.
  • Step S11 The RLC uplink window of 5G NR in confirmation mode is implemented using the first pointer array; in the first pointer array, the size of each first basic unit is M1 ⁇ N1 bytes; the first pointer array is at most L1 a basic unit.
  • Step S12 Initially allocate a memory of the first basic unit size for the first pointer array, use M1 bytes to record a pointer, and each pointer points to the storage address of the original data of the uplink RLC PDU to be sent by the UE with a specific serial number .
  • Step S13 If the allocated memory of the first pointer array is not used up, the UE uses a pointer in the allocated memory of the first pointer array to record the storage address of the original data of the uplink RLC PDU to be sent. If the allocated memory of the first pointer array is used up, the UE allocates a memory of the first basic unit size for the first pointer array, and uses a pointer to record the to-be-sent memory in the newly allocated memory of the first pointer array. The storage address of the original data of the uplink RLC PDU; the memory space of the first pointer array is allocated up to the size of L1 first basic units.
  • Step S14 After the UE receives the uplink status report sent by the network side, the UE releases the memory space in the RLC uplink window of the pointer of the uplink RLC PDU that has received the ACK information from the network side.
  • the step S13 and the step S14 are either carried out before, or carried out at the same time.
  • the above method implements the 5G NR RLC uplink window using the first pointer array that dynamically allocates and releases memory, which significantly saves the system memory usage.
  • M1 is 4 bytes
  • N1 is 4096 bytes
  • L1 is 64 bytes.
  • the RLC uplink window allocated by initialization can back up N1 uplink RLC PDUs.
  • step S14 when all the uplink RLC PDUs corresponding to all pointers in a certain first basic unit receive ACK information, the memory of the first basic unit is released for the first pointer array.
  • Step S21 The RLC downlink window of 5G NR in confirmation mode is realized by the second pointer array; in the second pointer array, the size of each second basic unit is M2 ⁇ N2 bytes; the second pointer array is at most L2 Two basic units.
  • Step S22 Initially allocate a memory with the size of the second basic unit for the second pointer array, and use M2 bytes to record the sequence number of a downlink RLC PDU and downlink reception information.
  • Step S23 If the allocated memory of the second pointer array is not used up, the UE records the serial number of the newly received downlink RLC PDU and the downlink reception information in the allocated memory of the second pointer array. If the allocated memory of the second pointer array is used up, the UE allocates a second basic unit of memory for the second pointer array, and records the newly received downlink RLC PDU in the newly allocated memory of the second pointer array serial number and downlink receiving information; the memory space of the second pointer array is allocated up to the size of L2 second basic units.
  • Step S24 The UE releases the memory space of the received complete downlink RLC PDU in the RLC downlink window. The step S23 and the step S24 are either carried out before, or carried out at the same time.
  • the above method implements the 5G NR RLC downlink window using the second pointer array that dynamically allocates and releases memory, which significantly saves the system memory usage.
  • M2 is 8 bytes
  • N2 is 4096
  • L2 is 64.
  • the downlink reception information includes: whether the downlink RLC PDU of the current sequence number has been received; whether the downlink RLC PDU of the current sequence number has been segmented; whether the downlink RLC PDU of the current sequence number has been segmented; Segmentation, whether all segments have been received completely; the RLC downlink window allocated by initialization can back up N2 downlink RLC PDUs.
  • step S24 when all the corresponding downlink RLC PDUs in a certain second basic unit are completely received, the memory of the second basic unit is released for the second pointer array.
  • This application also proposes a device for 5G NR RLC window memory optimization management, including a first implementation unit, a first initial allocation unit, a first subsequent allocation unit, and a first release unit.
  • the first implementation unit is used to implement the RLC uplink window of 5G NR in confirmation mode using the first pointer array; in the first pointer array, the size of each first basic unit is M1 ⁇ N1 bytes; the first pointer The array has a maximum of L1 first basic units.
  • the first initial allocation unit is used to initialize and allocate a memory of the first basic unit size for the first pointer array, and use M1 bytes to record a pointer, and each pointer points to an uplink RLC PDU that is about to be sent by a UE with a specific serial number The storage address of the original data.
  • the first subsequent allocation unit is used to use a pointer to record the storage of the original data of the uplink RLC PDU to be sent in the allocated memory of the first pointer array when the allocated memory of the first pointer array is not used up address; it is also used to allocate a memory of the first basic unit size for the first pointer array when the allocated memory of the first pointer array is used up, and adopt a memory in the newly allocated memory of the first pointer array
  • the pointer records the storage address of the original data of the uplink RLC PDU to be sent; the memory space of the first pointer array is allocated as the size of L1 first basic units at most.
  • the first release unit is used to release the memory space in the RLC uplink window of the pointer of the uplink RLC PDU that has received the ACK information from the network side after the UE receives the uplink status report sent by the network side.
  • the above device realizes the 5G NR RLC uplink window using the first pointer array that dynamically allocates memory and releases memory, which significantly saves the system memory usage.
  • the present application also proposes a device for 5G NR RLC window memory optimization management, including a second implementation unit, a second initial allocation unit, a second subsequent allocation unit, and a second release unit.
  • the second implementation unit is used to implement the RLC downlink window of 5G NR in confirmation mode using a second pointer array; in the second pointer array, the size of each second basic unit is M2 ⁇ N2 bytes; the second pointer The array has a maximum of L2 second basic units.
  • the second initial allocation unit is used to initialize and allocate a second basic unit of memory for the second pointer array, and use M2 bytes to record the sequence number and downlink reception information of a downlink RLC PDU.
  • the second subsequent allocation unit is used to record the sequence number and downlink reception information of the newly received downlink RLC PDU in the allocated memory of the second pointer array when the allocated memory of the second pointer array is not used up; It is also used to increase and allocate a second basic unit of memory for the second pointer array when the allocated memory of the second pointer array is used up, and record the newly received memory in the newly allocated memory of the second pointer array.
  • the sequence number of the downlink RLC PDU and the downlink receiving information; the memory space of the second pointer array is allocated up to the size of L2 second basic units.
  • the second release unit is used to release the memory space of the received complete downlink RLC PDU in the RLC downlink window.
  • the above device implements the 5G NR RLC downlink window using the second pointer array that dynamically allocates memory and releases memory, which significantly saves the system memory usage.
  • the technical effect achieved by this application is that the 5G NR RLC uplink and downlink windows are respectively implemented using the first pointer array and the second pointer array that dynamically allocate memory and release memory, which significantly saves the system memory usage.
  • FIG. 1 is a schematic flow diagram of Embodiment 1 of the method for 5G NR RLC window memory optimization management proposed by the present application.
  • FIG. 2 is a schematic flow diagram of Embodiment 2 of the method for 5G NR RLC window memory optimization management proposed by this application.
  • FIG. 3 is a schematic structural diagram of Embodiment 1 of the device for 5G NR RLC window memory optimization management proposed by this application.
  • FIG. 4 is a schematic structural diagram of Embodiment 2 of the device for 5G NR RLC window memory optimization management proposed by this application.
  • 11 is the first realization unit
  • 12 is the first initial allocation unit
  • 13 is the first subsequent allocation unit
  • 14 is the first release unit
  • 21 is the second realization unit
  • 22 is the second initial allocation Unit
  • 23 is the second subsequent allocation unit
  • 24 is the second release unit.
  • Embodiment 1 of the method for memory optimization management of 5G NR RLC window proposed by this application includes the following steps, which is applicable to 5G NR RLC uplink window.
  • Step S11 The RLC uplink window of the 5G NR in the confirmation mode is realized by using the first pointer array.
  • Pointer arrays are also called dynamic two-dimensional arrays.
  • the size of each first basic unit is M1 ⁇ N1 bytes.
  • the first pointer array has a maximum size of M1 ⁇ N1 ⁇ L1 bytes, that is, a maximum of L1 first basic units.
  • the size of the first basic unit can be deformed according to actual needs.
  • M1 is 4 bytes
  • N1 is 4096
  • L1 is 64.
  • Step S12 Initially allocate a memory of the first basic unit size for the first pointer array, use M1 bytes to record a pointer, and each pointer points to the storage address of the original data of the uplink RLC PDU to be sent by the UE with a specific serial number , that is, the initially allocated RLC uplink window can back up N1 uplink RLC PDUs.
  • Step S13 If the allocated memory of the first pointer array is not used up, the UE uses a pointer in the allocated memory of the first pointer array to record the storage address of the original data of the uplink RLC PDU to be sent.
  • the UE allocates a memory of the first basic unit size for the first pointer array, and uses a pointer to record the to-be-sent memory in the newly allocated memory of the first pointer array.
  • the RLC uplink window for newly allocated memory can add N1 uplink RLC PDUs for backup. And so on, but the memory space of the first pointer array is allocated up to the size of L1 first basic units.
  • Step S14 After the UE receives the uplink status report sent by the network side, the UE releases the memory space in the RLC uplink window of the pointer of the uplink RLC PDU that has received the ACK information from the network side. When all the uplink RLC PDUs corresponding to all pointers in a certain first basic unit receive ACK information, the memory of the first basic unit is released for the first pointer array.
  • step S13 and step S14 is not strictly limited, and can be performed either before or at the same time.
  • the traditional 5G NR RLC uplink window adopts a static memory allocation method.
  • the 5G NR RLC uplink window of this application adopts the memory allocation method of dynamic array, and applies for the memory size of the first basic unit each time, and then manages it reasonably and allocates it on demand.
  • the size of the RLC uplink window is 2048. At this time, the RLC uplink window only needs one first basic unit; at the same time, the above step S13 is omitted.
  • the size of the RLC uplink window is 131072. At this time, the RLC uplink window needs one or more first basic units.
  • the memory optimization management steps of the 5G NR RLC uplink window are as follows. (1) The RLC of the UE receives a new uplink RLC SDU. (2) The RLC of the UE assembles the new RLC SDU into an RLC PDU and assigns a sequence number to the RLC PDU, and records it in the parameter TX_NEXT. (3) The RLC of the UE judges whether the new RLC PDU exceeds the allocated memory size of the first pointer array. If not, the RLC of the UE records the pointer of the new RLC PDU in the allocated memory of the first pointer array.
  • the RLC of the UE dynamically allocates a new memory space of the size of the first basic unit for the first pointer array, and records the pointer of the new RLC PDU in the newly allocated memory of the first pointer array.
  • the pointer of the new RLC PDU points to the storage address of the original data of the new RLC PDU, which is used to back up all the data information of the original RLC PDU, in order to prevent the RLC PDU from being retransmitted.
  • the size of each pointer variable is, for example, 4 bytes.
  • the RLC of the UE receives the uplink status report, and updates the parameter TX_NEXT_ACK according to the information therein.
  • the RLC of the UE releases the memory space in the RLC uplink window of the pointer of the uplink RLC PDU that has received the ACK information from the network side.
  • the memory of the first basic unit is released.
  • the second embodiment of the method for memory optimization management of 5G NR RLC window proposed by this application includes the following steps, which is applicable to 5G NR RLC downlink window.
  • Step S21 The RLC downlink window of the 5G NR in the confirmation mode is realized by the second pointer array.
  • Pointer arrays are also called dynamic two-dimensional arrays.
  • the size of each second basic unit (one-dimensional array) is M2 ⁇ N2 bytes.
  • the second pointer array has a maximum size of M2 ⁇ N2 ⁇ L2 bytes, that is, a maximum of L2 second basic units.
  • the size of the second basic unit can be deformed according to actual needs.
  • M2 is 8 bytes
  • N2 is 4096
  • L2 is 64.
  • Step S22 Initially allocate a memory with the size of the second basic unit for the second pointer array, and use M2 bytes to record the sequence number of a downlink RLC PDU and downlink reception information.
  • the downlink reception information includes: whether the downlink RLC PDU of the current sequence number has been received; whether the downlink RLC PDU of the current sequence number has been segmented; if the downlink RLC PDU of the current sequence number has been segmented, whether the complete part has been received part. That is, the RLC downlink window allocated by initialization can back up the sequence numbers and downlink reception information of N2 downlink RLC PDUs.
  • Step S23 If the allocated memory of the second pointer array is not used up, the UE records the serial number of the newly received downlink RLC PDU and the downlink reception information in the allocated memory of the second pointer array.
  • the UE allocates a second basic unit of memory for the second pointer array, and records the newly received downlink RLC PDU in the newly allocated memory of the second pointer array serial number and downlink receiving information.
  • the RLC downlink window for newly allocated memory can add the sequence numbers and downlink receiving information of N2 downlink RLC PDUs. And so on, but the memory space of the second pointer array is allocated up to the size of L2 second basic units.
  • Step S24 The UE releases the memory space of the received complete downlink RLC PDU in the RLC downlink window.
  • the corresponding downlink RLC PDUs in a certain second basic unit are all received completely, the memory of the second basic unit is released for the second pointer array.
  • step S23 and step S24 is not strictly limited, and can be performed either before or at the same time.
  • the traditional 5G NR RLC downlink window adopts a static memory allocation method.
  • the 5G NR RLC downlink window of this application adopts the memory allocation method of dynamic array, and applies for the memory size of a second basic unit each time, and then manages it reasonably and allocates it on demand.
  • the size of the RLC downlink window is 2048, and the RLC downlink window only needs one second basic unit; meanwhile, the above step S23 is omitted.
  • the size of the RLC downlink window is 131072. At this time, the RLC downlink window needs one or more second basic units.
  • the memory optimization management steps of the 5G NR RLC downlink window are as follows. (1) The RLC of the UE receives a new downlink RLC PDU, and updates the state variable RX_NEXT according to its sequence number. (2) The RLC of the UE judges whether the quantity of the received downlink RLC PDU exceeds the allocated memory size of the second pointer array. If not, the RLC of the UE records the sequence number and downlink reception information of the new RLC PDU in the allocated memory of the second pointer array.
  • the RLC of the UE increases and allocates a second basic unit of memory for the second pointer array, and records the sequence number of the new downlink RLC PDU and downlink reception information in the newly allocated memory of the RLC downlink window.
  • the RLC of the UE releases the memory space of the received complete downlink RLC PDU in the RLC downlink window. When all the corresponding downlink RLC PDUs in a certain second basic unit are completely received, the memory of the second basic unit is released.
  • the first embodiment of the device for 5G NR RLC window memory optimization management proposed by this application includes a first implementation unit 11, a first initial allocation unit 12, a first subsequent allocation unit 13 and a first release unit 14, applicable In the 5G NR RLC uplink window.
  • the first implementation unit 11 is used to implement the RLC uplink window of the 5G NR in the acknowledged mode using the first pointer array.
  • the size of each first basic unit is M1 ⁇ N1 bytes.
  • the first pointer array is at most L1 first basic units.
  • the first initial allocation unit 12 is used to initialize and allocate a memory of a first basic unit size for the first pointer array, and use M1 bytes to record a pointer, and each pointer points to an uplink RLC to be sent by a UE with a specific serial number The storage address of the original data of the PDU.
  • the first follow-up allocation unit 13 is used to adopt a pointer to record the original data of the uplink RLC PDU to be sent in the allocated memory of the first pointer array when the allocated memory of the first pointer array is not used up.
  • Storage address it is also used to allocate a memory of the first basic unit size for the first pointer array when the allocated memory of the first pointer array is used up, and use the newly allocated memory of the first pointer array
  • a pointer records the storage address of the original data of the uplink RLC PDU to be sent.
  • the memory space allocated for the first pointer array is at most the size of L1 first basic units.
  • the first release unit 14 is used to release the memory space in the RLC uplink window of the pointer of the uplink RLC PDU that has received the ACK information from the network side after the UE receives the uplink status report sent by the network side.
  • the second embodiment of the device for 5G NR RLC window memory optimization management proposed by this application includes a second implementation unit 21, a second initial allocation unit 22, a second subsequent allocation unit 23, and a second release unit 24, applicable In the 5G NR RLC downlink window.
  • the second implementation unit 21 is used to implement the RLC downlink window of the 5G NR in the acknowledged mode using a second pointer array.
  • the size of each second basic unit is M2 ⁇ N2 bytes.
  • the second pointer array has a maximum of L2 second basic units.
  • the second initial allocation unit 22 is used to initialize and allocate a second basic unit of memory for the second pointer array, and use M2 bytes to record the sequence number and downlink reception information of a downlink RLC PDU.
  • the second follow-up allocation unit 23 is used to record the sequence number and downlink reception information of the newly received downlink RLC PDU in the allocated memory of the second pointer array when the allocated memory of the second pointer array is not used up ;It is also used to allocate a memory of the second basic unit size for the second pointer array when the allocated memory of the second pointer array is used up, and record the newly received memory in the newly allocated memory of the second pointer array The serial number of the downlink RLC PDU and the downlink reception information.
  • the memory space allocated for the second pointer array is at most the size of L2 second basic units.
  • the second release unit 24 is used to release the memory space of the received complete downlink RLC PDU in the RLC downlink window.
  • this application proposes a brand-new RLC uplink and downlink window in combination with the size of the RLC uplink and downlink windows corresponding to the serial numbers of the RLC PDUs of 12 bits and 18 bits and the actual implementation of the code.
  • the optimal management method of dynamic memory allocation and release can save system memory to the greatest extent.
  • the technical solution of the present application has been well verified in laboratory test scenarios and practical applications, and the effect is good.

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Abstract

La présente demande divulgue un procédé de gestion d'optimisation de mémoire d'une fenêtre de RLC de 5G NR. Une fenêtre de liaison montante de RLC de 5G NR dans un mode d'accusé de réception est réalisée au moyen d'un premier réseau de pointeurs. Une mémoire ayant la taille d'une première unité de base est préalablement attribuée au premier réseau de pointeurs. Si la mémoire attribuée du premier réseau de pointeurs a été utilisée, un UE attribue en outre une mémoire ayant la taille d'une première unité de base pour le premier réseau de pointeurs, et utilise un pointeur pour enregistrer, dans la mémoire nouvellement attribuée du premier réseau de pointeurs, une adresse de stockage de données originales d'une PDU de RLC de liaison montante à envoyer. Lors de la réception d'un rapport d'état de liaison montante envoyé par un côté réseau, l'UE libère un espace mémoire d'un pointeur d'une PDU de RLC de liaison montante qui a reçu des informations ACK du côté réseau dans la fenêtre de liaison montante de RLC. Selon le procédé décrit, une fenêtre de liaison montante de RLC de 5G NR est réalisée au moyen d'un premier réseau de pointeurs auquel une mémoire est attribuée et libérée de manière dynamique, ce qui permet de réduire considérablement l'occupation d'une mémoire système.
PCT/CN2022/123734 2021-11-03 2022-10-08 Procédé et appareil de gestion d'optimisation de mémoire de fenêtre rlc de 5g nr WO2023078014A1 (fr)

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