CN103634847B - The data balancing method and system shunted between the base station of HSDPA multi-stream - Google Patents

The data balancing method and system shunted between the base station of HSDPA multi-stream Download PDF

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Publication number
CN103634847B
CN103634847B CN201210312825.8A CN201210312825A CN103634847B CN 103634847 B CN103634847 B CN 103634847B CN 201210312825 A CN201210312825 A CN 201210312825A CN 103634847 B CN103634847 B CN 103634847B
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base station
data
rlc
rlc data
network controller
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CN103634847A (en
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潘凤艳
张瑜
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ZTE Corp
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ZTE Corp
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Priority to PCT/CN2013/081317 priority patent/WO2014032512A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/08—Load balancing or load distribution
    • H04W28/086—Load balancing or load distribution among access entities
    • H04W28/0861—Load balancing or load distribution among access entities between base stations

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses the data balancing method shunted between a kind of base station of HSDPA multi-stream, system, base station and radio network controllers, wherein this method comprises: base station receives the status feedback information of the base station shunted between the participation base station from radio network controller；Base station adjusts the data transmission capabilities of base station according to status feedback information.By with the present invention, it solves based in the related technology, load and time delay due to each base station for participating in shunting be not identical, cause the RLC data of big serial number than the first arrival UE of small serial number, cause " SKEW " phenomenon, data are caused to send unbalanced problem, base station can be adjusted according to the current state in each base station, improve the performance of system.

Description

Method and system for balancing data shunted between HSDPA multi-flow base stations
Technical Field
The present invention relates to the field of communications, and in particular, to a method, a system, a base station, and a radio network controller for balancing data shunted between base stations in High Speed Downlink Packet Access (HSDPA) multiple streams.
Background
With the continuous and rapid development of data services, High Speed Packet Access (HSPA) technology is becoming more and more popular and is developing towards multi-antenna and multi-carrier. For example, the R7 version of the third Generation partnership project (3 rd Generation partnership project, 3 GPP) introduces a Multiple Input Multiple Output (MIMO) technology, so that a base station (e.g., NodeB) can simultaneously transmit two transport blocks from the same cell to a User Equipment (UE) through two antennas; subsequently, the R8 version of 3GPP introduced a Dual Cell HSDPA (Dual Cell HSDPA, abbreviated DC-HSDPA) technology, so that a base station can simultaneously transmit HSDPA data to a UE from two frequency points of two adjacent cells. The introduction of these two techniques greatly improves the data throughput of the cell.
When the UE is located at the edge of two cells with the same frequency and performs soft handover or softer handover, the air interface capability of a cell serving a High Speed Downlink Shared Channel (HS-DSCH) is often limited, and a non-serving HS-DSCH cell in an active set also has available resources. Therefore, release R11 of 3GPP started to discuss the multi-stream technique of HSDPA.
According to the division of the divided nodes, the HSDPA multi-flow technology is divided into intra-NodeB division and inter-NodeB division. For the inter-NodeB offloading, the 3GPP conference determines that user data is offloaded in a Radio Link Control (RLC) layer, that is, a Radio Network Controller (RNC) numbers user data uniformly in the RLC layer, and then offloads the RLC data to different base stations according to the capability of the base stations. Due to the different loading and delay of the base station, the RLC data with large sequence number may arrive at the UE before the RLC data with small sequence number, which is a so-called imbalance (abbreviated as "SKEW").
Aiming at the phenomenon of SKEW, the UE cannot determine whether RLC data are discarded or out of order, so that a 3GPP conference determines to introduce a t-reordering timer at the UE side, when the UE receives a large sequence number but does not receive RLC data with a small sequence number, the t-reordering timer is started, if the timer is overtime and does not receive RLC data with a small sequence number, the UE considers that the RLC data with the small sequence number are discarded, and sends a Negative Acknowledgement character (NACK for short) status packet to the network side to request retransmission at the network side. However, the introduction of the t-reordering timer also introduces a delay of data Transmission, which may cause the RLC window not to slide in time to cause the RLC window to be full, and may also cause the performance of a Transmission Control Protocol (TCP) to be deteriorated, thereby affecting the data throughput.
Disclosure of Invention
The invention provides a method, a system, a base station and a wireless network controller for balancing data shunted among HSDPA multi-flow base stations, which at least solve the problem of unbalanced data transmission caused by the phenomenon of SKEW (scanning overhead wire) because RLC data with large serial numbers arrive at UE (user equipment) before small serial numbers due to different loads and time delays of all base stations participating in shunting in the related technology.
According to an aspect of the present invention, there is provided a method for balancing data shunted between base stations in HSDPA multiflow, including: the base station receives state feedback information of base stations participating in flow distribution among the base stations from a wireless network controller; and the base station adjusts the data sending capability of the base station according to the state feedback information.
Preferably, the receiving, by the base station, the state feedback information of the base stations participating in the inter-base station offloading from the radio network controller includes: the base station receives state feedback information of all base stations participating in flow distribution among the base stations from the wireless network controller; or the base station receives state feedback information of other base stations except the base station, which participate in the inter-base station shunting, from the wireless network controller.
Preferably, before the base station receives the status feedback information of other base stations except the base station, which participate in inter-base station offloading from the radio network controller, the method further includes: and the base station sends the state feedback information to the wireless network controller, wherein the state feedback information comprises the sequence number of the largest RLC data which are currently sent by the base station.
Preferably, before the base station sends the status feedback information to the radio network controller, the method further includes: and the radio network controller sends HS-DSCH data frames to all base stations participating in the flow distribution among the base stations, wherein the HS-DSCH data frames carry RLC data and the sequence numbers of the RLC data.
Preferably, the HS-DSCH Data frame carries an RLC Data Protocol Data Unit (PDU for short) and an RLC Data PDU number, where the RLC PDU includes an RLC Data PDU.
Preferably, after the radio network controller sends the HS-DSCH data frame to each base station participating in the inter-base station offloading, the method further includes: and the base station analyzes the HS-DSCH data frame from the wireless network controller, wherein the base station analyzes the RLC data PDU of the HS-DSCH data frame to obtain the RLC data PDU sequence number, or the base station analyzes the RLC data PDU sequence number of the HS-DSCH data frame to directly obtain the RLC data PDU sequence number.
Preferably, the sending, by the base station, the status feedback information to the radio network controller includes: and the base station sends the largest RLC data PDU sequence number which is sent and confirmed by a Hybrid Automatic repeat request (HARQ) to the radio network controller through the HS-DSCH capability allocation frame.
Preferably, after the base station sends the status feedback information to the radio network controller, the method further includes: and the wireless network controller sends the state feedback information of the other base stations to the base stations.
Preferably, the transmitting, by the radio network controller, the status feedback information of the other base station to the base station includes: the radio network controller judges whether the RLC data PDU with a large sequence number is already sent but the RLC data PDU with a small sequence number is not sent according to VT (A) and the largest RLC data PDU sequence number which is fed back by each base station participating in the flow distribution among the base stations and is confirmed by the HARQ; and if so, sending the VT (A) and the maximum RLC data PDU sequence number which is fed back by the other base stations and confirmed by the HARQ to the base stations, wherein the VT (A) is the sequence number of the RLC data PDU which is waited to be confirmed by the User Equipment (UE) by the radio network controller.
Preferably, the adjusting, by the base station, the data transmission capability of the base station according to the state feedback information includes: the base station accelerates or decelerates the sending speed of the RLC PDU to the air interface; or discarding part of RLC data PDUs, and informing the radio network controller to retransmit the discarded RLC data PDUs, wherein the RLC PDUs comprise RLC data PDUs.
Preferably, the data transmission capability of the base station is adjusted according to the maximum RLC data PDU number of the base station and the status feedback information of the other base stations.
Preferably, the base station adjusts its data transmission capability in the following manner: the base station judges whether the RLC data PDU with a large sequence number exists in the buffer memory of the base station and the RLC data PDU with a small sequence number exists in the buffer memory of the base station according to VT (A) and the maximum RLC data PDU sequence number which is fed back by the other base station and is confirmed by HARQ; if the number of the RLC data PDUs is the same as the preset number, the data transmission capability of the base station is adjusted according to the condition of the occupiable resources, wherein the RLC data PDUs with small sequence numbers in the buffer of the base station are sent in an accelerated manner under the condition of the occupiable resources, part of the RLC data PDUs are discarded under the condition of no occupiable resources, and the radio network controller is informed to retransmit the discarded RLC data PDUs, wherein VT (A) is the sequence number of the RLC data PDUs which are waited to be confirmed by user equipment UE by the radio network controller.
Preferably, the base station adjusts its data transmission capability in the following manner: the base station judges whether the situation that the maximum RLC data PDU serial number confirmed by the HARQ of the other base station is very small but the base station sends the RLC data PDU with a large serial number exists according to the VT (A) and the maximum RLC data PDU serial number confirmed by the HARQ fed back by the other base station; if yes, and meeting the preset condition, slowing down the sending speed of the RLC data PDU to an air interface, wherein the VT (A) is a sequence number of the RLC data PDU which is waited by the wireless network controller and confirmed by the user equipment UE.
Preferably, after the base station discards part of the RLC data PDUs and notifies the radio network controller to retransmit the discarded RLC data PDUs, the method further includes: and the wireless network controller retransmits the RLC data PDU discarded by the base station according to the packet loss instruction of the base station.
Preferably, the HS-DSCH data frame includes at least one of: HS-DSCH type 1 data frame and HS-DSCH type 2 data frame.
Preferably, the RLC Mode is an Acknowledgement (AM) Mode.
According to an aspect of the present invention, there is provided a base station including: the receiving module is used for receiving state feedback information of base stations participating in flow distribution among the base stations from the wireless network controller; and the adjusting module is used for adjusting the data sending capability of the base station according to the state feedback information.
Preferably, the base station further includes: and a sending module, configured to send the status feedback information to the radio network controller, where the status feedback information includes a sequence number of the largest RLC data that has been currently sent by the base station.
Preferably, the base station further includes: and the analysis module is used for analyzing the HS-DSCH data frame from the wireless network controller, wherein the base station analyzes the RLC data PDU of the HS-DSCH data frame to obtain the RLC data PDU sequence number, or the base station analyzes the RLC data PDU sequence number of the HS-DSCH data frame to directly obtain the RLC data PDU sequence number.
According to an aspect of the present invention, there is provided a radio network controller including: a receiving module, configured to receive the state feedback information from each base station participating in inter-base station offloading; and the first sending module is used for sending the state feedback information of other base stations except the first base station in each base station to the first base station.
Preferably, the radio network controller further comprises: and the second sending module is used for sending HS-DSCH data frames to each base station participating in the flow distribution among the base stations, wherein the HS-DSCH data frames carry Radio Link Control (RLC) data and sequence numbers of the RLC data.
Preferably, the radio network controller further comprises: and the retransmission module is used for retransmitting the RLC data PDU discarded by the first base station according to the lost packet indication of the first base station.
According to an aspect of the present invention, there is provided a data equalization system for HSDPA multi-streaming offload between base stations, including: the base station of any preceding claim and the radio network controller of any preceding claim.
The invention adopts the following method: and the base station receives the state feedback information of the base stations participating in the flow distribution among the base stations and adjusts the data sending capability of the base station according to the state feedback information of the base stations. By applying the invention, the problem of unbalanced data transmission caused by the phenomenon of SKEW (scanning overhead wire) because the RLC data with a large sequence number arrives at the UE before the RLC data with a small sequence number due to different loads and time delays of all base stations participating in shunting in the related technology is optimized, and the base stations can be adjusted according to the current state of each base station, thereby improving the system performance.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a flowchart of a data equalization method for inter-base station offload for HSDPA multi-streaming according to an embodiment of the present invention;
fig. 2 is a block diagram of a data equalization system for inter-base station offload for HSDPA multi-streaming according to an embodiment of the present invention;
FIG. 3 is a block diagram of a base station according to an embodiment of the present invention;
FIG. 4 is a block diagram of a second embodiment of a base station according to the present invention;
fig. 5 is a first block diagram of a radio network controller according to an embodiment of the present invention;
fig. 6 is a block diagram of a second radio network controller according to an embodiment of the present invention;
FIG. 7 is a flow chart of a data equalization method according to a first preferred embodiment of the present invention;
fig. 8 is a diagram illustrating a HS-DSCH type 1 data frame structure according to a second preferred embodiment of the present invention;
fig. 9 is a diagram illustrating a HS-DSCH type 2 data frame structure according to a second preferred embodiment of the present invention;
fig. 10 is a diagram illustrating a structure of an HS-DSCH type 1 capability allocation frame according to a second preferred embodiment of the present invention;
fig. 11 is a diagram illustrating a structure of an HS-DSCH type 2 capability allocation frame according to a second preferred embodiment of the present invention;
fig. 12 is a diagram illustrating a structure of an HS-DSCH capability request frame according to a second preferred embodiment of the present invention;
fig. 13 is a schematic diagram of an HS-DSCH packet loss indication frame structure in accordance with a second preferred embodiment of the present invention;
FIG. 14 is a flow chart of a data equalization method according to a first embodiment of the present invention;
fig. 15 is a flowchart of node b speeding up or slowing down air interface data transmission according to the second embodiment of the present invention;
fig. 16 is a flow chart of NodeB discarding data and instructing RNC to retransmit according to example three of the present invention.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
Based on the related art, as the load and the time delay of each base station participating in the offloading are different, the RLC data with a large sequence number arrives at the UE before the RLC data with a small sequence number, which causes a "SKEW" phenomenon, and causes a problem of data transmission imbalance, an embodiment of the present invention provides a data equalization method for offloading among base stations of HSDPA multiflow, where a flow of the method is shown in fig. 1, and the method includes steps S102 to S104:
step S102, a base station receives state feedback information of base stations participating in flow distribution among the base stations from a wireless network controller;
and step S104, the base station adjusts the data sending capability of the base station according to the state feedback information.
The embodiment of the invention adopts the following method: and the base station receives the state feedback information of the base stations participating in the flow distribution among the base stations and adjusts the data sending capability of the base station according to the state feedback information of the base stations. By applying the embodiment of the invention, the problem of unbalanced data transmission caused by the phenomenon of SKEW because the RLC data with a large sequence number arrives at the UE before the RLC data with a small sequence number due to different loads and time delays of all base stations participating in shunting in the related technology is optimized, and the base stations can be adjusted according to the current states of all the base stations, thereby improving the performance of the system.
The base station receiving the state feedback information of the base station participating in the inter-base station offloading from the radio network controller may include various situations, for example, the base station receiving the state feedback information of all the base stations including the self state feedback information sent by the radio network controller, or receiving the state feedback information of a part of the base stations participating in the inter-base station offloading. The following description will be given taking the case of receiving state feedback information of other base stations than the base station itself.
Before the base station receives the state feedback information of other base stations participating in the inter-base station shunting from the radio network controller, the base station can also receive an HS-DSCH data frame from the radio network controller, wherein the HS-DSCH data frame is used for sending RLC data with allocated sequence numbers to the base station, and the data frame also carries the sequence numbers of the RLC data. The HS-DSCH data frame may be a plurality of types of data frames, for example, an HS-DSCH type 1 data frame, or an HS-DSCH type 2 data frame; the mode of the RLC is set to the acknowledged AM mode.
The base station may parse the received HS-DSCH data frame and send status feedback information to the radio network controller, where the status feedback information may be a sequence number of the largest RLC data that has been sent by itself.
In the implementation process, the parsing method may include multiple methods, and the following describes a case where the HS-DSCH data frame carries RLC data PDU and/or RLC data PDU sequence number.
The base station can analyze the RLC data PDU of the HS-DSCH data frame to further obtain the RLC data PDU sequence number, or the base station can analyze the RLC data PDU sequence number of the HS-DSCH data frame to directly obtain the RLC data PDU sequence number.
The process of the base station sending the status feedback information to the radio network controller may be that the base station may send the largest RLC data PDU number that has been sent and received HARQ acknowledgement to the radio network controller.
When the method is implemented, the wireless network controller receives the information fed back by each base station, summarizes the state feedback information of each base station, and then sends the information to each base station participating in shunting. The radio network controller judges whether the RLC data PDU with a large sequence number is sent and the RLC data PDU with a small sequence number still exists in the buffer memory of the base station according to VT (A) and the maximum RLC data PDU sequence number which is fed back by each base station and confirmed by HARQ; and if the situation exists, considering that the data transmission of each base station is unbalanced, and if the degree of the unbalance reaches a certain threshold, transmitting VT (A) and the maximum RLC data PDU sequence number which is fed back by each base station and is acknowledged by the HARQ to other base stations, wherein VT (A) is the sequence number of the RLC data PDU which is waited by the radio network controller and is acknowledged by the user equipment UE. The RLC data PDU with a large sequence number refers to the RLC data allocated to the HS-DSCH data frame with a large sequence number, e.g., 16 to 31, and a large sequence number relative to 0 to 15, and the small sequence number refers to the RLC data allocated with a relatively small sequence number, e.g., 0 to 15.
The base station adjusts the data sending capability of the base station according to the local maximum RLC data PDU serial number and the state feedback information of other base stations, and the base station can accelerate or decelerate the sending speed of the RLC PDUs to the air interface; alternatively, part of the RLC data PDUs are discarded and the radio network controller is informed to retransmit the discarded RLC data PDUs.
In the implementation process, the base station may adjust the data transmission capability of the base station in the following manner:
the first mode is as follows: the base station judges whether other base stations send RLC data PDUs with large sequence numbers and the buffer of the base station has RLC data PDUs with small sequence numbers according to VT (A) and the maximum RLC data PDU sequence numbers which are fed back by other base stations and are confirmed by HARQ; if yes, adjusting the data transmission capability of the mobile terminal according to the condition of the occupiable resources. And under the condition that the occupiable resources exist, accelerating to send the RLC data PDU with the small sequence number in the buffer of the base station, under the condition that the occupiable resources do not exist, discarding part of the RLC data PDUs, and informing the wireless network controller to retransmit the discarded RLC data PDUs.
The second mode is as follows: the base station judges whether the situation that the maximum RLC data PDU serial number which is already confirmed by HARQ of other base stations is very small but the base station already sends the RLC data PDU with the large serial number exists according to VT (A) and the maximum RLC data PDU serial number which is confirmed by HARQ and fed back by other base stations; if so, the rate of sending RLC data PDUs to the air interface can be slowed down as appropriate.
And if the base station selects to discard part of the RLC data PDUs, after the base station discards part of the RLC data PDUs and informs the radio network controller to retransmit the discarded RLC data PDUs, the radio network controller retransmits the RLC data PDUs discarded by the base station according to the lost packet indication of the base station.
An embodiment of the present invention further provides a system for balancing data shunted between HSDPA multiflow base stations, where the system may apply the data balancing method, and a structure of the system is shown in fig. 2, where the system includes: a base station 1 and a radio network controller 2. In this embodiment, the base station 1, as shown in fig. 3, includes: a receiving module 110, configured to receive state feedback information of base stations participating in inter-base station offloading from a radio network controller; the adjusting module 120 is coupled to the first receiving module 110, and configured to adjust the data sending capability of the local base station according to the state feedback information.
In a preferred embodiment, the base station 1 may also be as shown in fig. 4, where the base station 1 in fig. 4 further includes: a sending module 130, coupled to the first receiving module 110, configured to send status feedback information to the radio network controller, where the status feedback information includes a sequence number of the largest RLC data that has been currently sent by the base station.
The structure of the radio network controller 2 can be as shown in fig. 5, including: a receiving module 210, configured to receive status feedback information from each base station; a first sending module 220, coupled to the receiving module 210, configured to send the status feedback information of other base stations except the first base station to the first base station (i.e., the base station, i.e., any one of the base stations); a second sending module 230, coupled to the receiving module 210, configured to send a high-speed downlink shared channel HS-DSCH data frame to each base station participating in inter-base station offloading, where the HS-DSCH data frame carries radio link control RLC data and a sequence number of the RLC data.
In implementation, after receiving the state feedback information of each base station, the radio network controller 2 may send the state feedback information to each base station through the first sending module 220, that is, send the state feedback information of other base stations to the base station, where the sent state feedback information is all the state feedback information of other base stations except the base station.
The radio network controller 2 shown in fig. 6 further includes: and a retransmission module 240, coupled to the second sending module 230, configured to retransmit the RLC data PDU discarded by the base station according to the indication of lost packet of the base station.
In the implementation process, the radio network controller 2 may further include a module for determining whether there is a case where the RLC data PDU with the large sequence number has been sent but the RLC data PDU with the small sequence number still exists in the buffer of the base station according to vt (a) and the maximum RLC data PDU number fed back by each base station and acknowledged by HARQ, and if so, it is considered that data transmission between the base stations is unbalanced; and sending the vt (a) and the maximum RLC data PDU number fed back by each base station and acknowledged by the HARQ to other base stations when the imbalance reaches a certain degree, wherein the vt (a) is a module in which the radio network controller waits for the RLC data PDU number acknowledged by the user equipment UE.
In the implementation process, the base station 1 and the radio network controller 2 or a system formed by them may execute the data equalization method for offloading among the base stations of the HSDPA multiflow, which includes various functional modules in the method.
For example, the base station 1 may further include a parsing module for parsing the high speed downlink shared channel HS-DSCH data frame from the radio network controller, wherein the base station parses the RLC data PDU of the HS-DSCH data frame to obtain the RLC data PDU number, or the base station parses the RLC data PDU number of the HS-DSCH data frame to directly obtain the RLC data PDU number. And will not be described in detail herein.
Preferred embodiment 1
The preferred embodiment provides a data equalization method based on HSDPA multi-flow technology, where a base station is a NodeB and a Radio Network Controller is a Radio Network Controller (RNC for short). The flow of the method is shown in fig. 7, and includes steps S702 to S710.
In step S702, the RNC transmits an HS-DSCH data frame to each NodeB.
In the implementation process, the HS-DSCH data frame carries RLC PDUs, and the RLC PDUs comprise RLC data PDUs and RLC control PDUs. Further, the HS-DSCH data frame may also carry an RLC data PDU sequence number. Preferably, the HS-DSCH data frame can be set as an HS-DSCH type 1 data frame or an HS-DSCH type 2 data frame; the RLC mode is AM mode.
In step S704, each NodeB transmits a state feedback to the RNC.
The state feedback comprises that each NodeB feeds back the maximum RLC data PDU sequence number which is sent and confirmed by the HARQ to the RNC by analyzing the RLC data PDU sequence number; and the NodeB analyzes the RLC data PDU sequence number, including analyzing the HS-DSCH data frame to obtain the RLC data PDU sequence number, or analyzing the RLC data PDU in the HS-DSCH data frame to obtain the sequence number.
In step S706, the RNC transmits the degree of imbalance between the nodebs to the nodebs.
The RNC judges whether RLC data PDU with large sequence number is already sent and RLC data PDU with small sequence number still exists in buffer memory of NodeB according to VT (A) and maximum RLC data PDU sequence number which is fed back by each NodeB and confirmed by HARQ, and considers that the NodeB is unbalanced; if the unbalance reaches a certain degree, the maximum RLC data PDU sequence number which is confirmed by HARQ and fed back by each NodeB is sent to other NodeBs according to VT (A), wherein VT (A) refers to the sequence number of the RLC data PDU which is waited to be confirmed by the UE by the RNC.
In step S708, each NodeB determines to accelerate or decelerate transmission of RLC PDUs to the air interface, or discards part of RLC PDUs and notifies the RNC of retransmission.
Each NodeB judges whether other NodeBs have sent the RLC data PDU with a large sequence number or not according to VT (A) and the maximum RLC data PDU sequence number which is fed back by each NodeB and confirmed by the HARQ, and if the RLC data PDU with a small sequence number still exists in the buffer of the NodeB, the RLC data PDU with the small sequence number in the buffer is quickened to be sent if available resources exist, otherwise, part of the RLC data PDU is discarded and the RNC is informed to retransmit; or each NodeB judges that if the maximum RLC data PDU sequence number which is confirmed by HARQ and fed back by other NodeBs is small and the NodeB already sends the RLC data PDU with a large sequence number according to VT (A) and the maximum RLC data PDU sequence number which is confirmed by HARQ and fed back by each NodeB, the sending of the RLC data PDU to the air interface can be properly slowed down.
In step S710, the RNC receives the instruction of packet loss from each NodeB, and retransmits the RLC data PDU discarded by each NodeB.
In the preferred embodiment, the RNC brings the RLC data PDU number waiting for the UE to acknowledge and the maximum RLC data PDU number that has been sent by other NodeB and obtained HARQ acknowledgement to the NodeB, which is equivalent to notifying the NodeB of the current RLC sliding window state, so that the NodeB can sense the imbalance degree of the current HSDPA multi-flow, and take corresponding improvement measures in time, thereby effectively improving the data throughput of the cell.
Preferred embodiment two
The embodiment of the invention provides a data balancing method based on an HSDPA multi-flow technology. In implementation, the UE is in HSDPA multiflow state, and the RNC notifies each NodeB of the degree of imbalance between each NodeB according to the state feedback of each NodeB.
And the RNC sends an HS-DSCH data frame to each NodeB, wherein the data frame is any one of an HS-DSCH type 1 data frame and an HS-DSCH type 2 data frame.
The RNC carries the sequence number of the RLC data PDU in the HS-DSCH type 1 data frame, as shown in fig. 8, indicates whether the RLC controls the PDU by the reserved bit, the reserved bit is 0 to indicate that the RLC controls the PDU subsequently, the reserved bit is 1 to indicate that the RLC data PDU subsequently starts the sequence number; and after the starting sequence number of the RLC data PDU is finished, judging whether the RLC data PDU is continuous or not through a reserved bit, wherein the reserved bit is 0 to indicate that the RLC data PDU is continuous subsequently, and the reserved bit is 1 to indicate that the RLC data PDU is continuous subsequently or another group of RLC data PDUs with continuous sequence numbers.
The RNC carries the RLC data PDU number in the HS-DSCH type 2 data frame, as shown in fig. 9, indicates whether a block containing RLC control PDU is included by a reserved bit, where a reserved bit of 0 indicates a block containing RLC control PDU, and a reserved bit of 1 indicates a block containing RLC data packets with consecutive sequence numbers, and carries the starting RLC PDU number.
The state feedback of each NodeB comprises that each NodeB feeds back the maximum RLC data PDU sequence number which is sent and confirmed by the HARQ to the RNC through an HS-DSCH capability distribution frame by analyzing the RLC data PDU sequence number; as shown in fig. 10 and fig. 11, the HS-DSCH type 1 capability allocation frame and the HS-DSCH type 2 capability allocation frame are respectively shown, if AckInd is 1, it indicates that the maximum RLC data PDU number is carried; otherwise AckIndk is 0. In the implementation process, the frame is not limited to use of the two types of HS-DSCH capability allocation frames, and may be of other frame format types, which are not described herein again.
And the RNC judges the unbalance degree among the NodeBs according to the state feedback of the NodeBs and by combining VT (A), and informs the unbalance degree to the NodeBs if certain algorithm criteria are met. The imbalance degree between the nodebs can be embodied in that some nodebs already send RLC data PDUs with large sequence numbers to the UE but other nodebs have not sent RLC data PDUs with small sequence numbers to the UE.
The RNC informs each NodeB of the unbalance degree between the NodeBs, and informs each NodeB of the maximum RLC data PDU sequence number confirmed by HARQ of other current NodeBs and the current latest VT (A) through an HS-DSCH capability request frame; as shown in fig. 12, AckInd is 1, which indicates that the maximum RLC data PDU number that is acknowledged by HARQ by other NodeB is carried, otherwise AckInd is 0; VT (A) Ind is 1, which indicates carrying VT (A), otherwise VT (A) Ind is 0. Of course, it can be replaced by other frames similar to the format of the HS-DSCH capability request frame as long as the above-mentioned functions can be implemented.
Each NodeB judges the unbalance degree between the NodeBs according to the VT (A) and the maximum RLC data PDU serial numbers of the NodeB and other NdoeB, and corresponding measures are taken, for example, each NodeB accelerates or decelerates the RLC PDU to be sent to an air interface; or each NodeB discards partial RLC data PDU and informs the RNC of retransmission through HS-DSCH packet loss indication, as shown in FIG. 13, if DropBeginInd is 1, Dropped SN Begin is carried, otherwise DropBeginInd is 0; if DropEndInd is 1, indicating that Dropped SN End is carried, otherwise DropEndInd is 0; if DropBeginInd is 0 and DropEndInd is 1, indicating that the NodeB indicates the RNC to retransmit the RLC data PDU before the serial number Dropped SN End; if DropBeginInd is 1 and DropEndInd is 0, indicating that the NodeB indicates the RNC to retransmit the RLC data PDU after the serial number Dropped SN Begin; if DropBeginInd and DropEndInd are both 1, indicating that the NodeB indicates the RNC to retransmit the RLC data PDU with the sequence number between Dropped SN Begin and Dropped SN End; the control frame type HS-DSCHDROP INDICATION takes the value 1110.
And after receiving the packet loss notification of each NodeB, the RNC retransmits the RLC data PDU discarded by the NodeB according to a certain scheduling algorithm.
The above embodiments are described below by way of examples.
Example one
As shown in fig. 14, a flowchart of a data equalization method proposed by the present invention is shown, and the flowchart includes steps S1402 to S1420.
Step S1402, when the UE is in the multi-flow state of each NodeB, the RNC receives the user data of the UE, and the RLC segments and numbers are distributed to each NodeB according to a certain algorithm.
In step S1404, the NodeB feeds back the RLC sequence number that is maximally acknowledged by the HARQ to the RNC, and the RNC determines whether the degree of imbalance between the nodebs reaches a predetermined threshold. If so, step S1406 is performed, otherwise step S1420 is performed.
In step S1406, the RNC notifies the NodeB of the degree of imbalance between the nodebs.
In step S1408, the NodeB determines whether data transmission needs to be accelerated. If so, step S1410 is performed, otherwise step S1418 is performed.
In step S1410, the NodeB determines whether there are available resources. If so, step S1412 is executed, otherwise, step S1414 is executed.
In step S1412, the NodeB accelerates the data transmission from the air interface. Step S1420 is performed.
In step S1414, the NodeB discards part of the data and informs the RNC to retransmit it.
In step S1416, the RNC retransmits the data discarded by the NodeB. Step S1420 is performed.
In step S1418, the NodeB appropriately slows down the transmission of data over the air.
Step S1420, end data equalization.
Example two
The current scenario is now set as follows: an RNC1 belongs to a Core Network (CN) 1 for management; NodeB1 and NodeB2 home RNC 1; cell (Cell, abbreviated) 1 home NodeB1 management; CELL2 home NodeB2 management; CELL1 and CELL2 have a common coverage area; the UE1 resides in the common coverage area of CELL1 and CELL2 and is in HSDPA dual-flow state; the user data of UE1 in the RNC1 buffer has all been sent out and confirmed by UE1, and sequence number vt (a) of RNC1 waiting for confirmation by UE1 is 0.
Fig. 15 is a flowchart of node b accelerating or slowing down air interface data transmission, and the process includes step S1502 to step S1514.
In step S1502, the RNC1 receives the user data of the UE1 from the CN1 and performs segmentation and allocation. The data is divided into sequence numbers 0-31 through RLC, and is averagely shunted to NodeB1 and NodeB2, namely, data framing of sequence numbers 0-15 can be sent to NodeB1, and data framing of sequence numbers 16-31 can be sent to NodeB 2.
In step S1504, the RNC1 receives the user data of the UE1 from the CN1 again, and performs division allocation. The data are divided into sequence numbers 32-63 through RLC, and are averagely shunted to NodeB1 and NodeB2, namely data frames with sequence numbers 32-47 are sent to NodeB1, and data frames with sequence numbers 48-63 are sent to NodeB 2.
In step S1506, the signal quality of the NodeB1 and NodeB2 changes, and state feedback information is transmitted to the RNC 1.
And the NodeB1 retransmits the signal through an air interface due to the deterioration of the signal, and sends the current state to the RNC1 through an HS-DSCH capability allocation frame, wherein AckInd in the HS-DSCH capability allocation frame is 1, and Max Acked SN is 4. The NodeB2 sends a status report to the RNC1 through the HS-DSCH capability allocation frame, where AckInd is 1 and maxched SN is 45, since the signal is good, most of the data is acknowledged soon.
In step S1508, after the RNC1 receives the status feedback information of the NodeB1 and NodeB2, it is determined that a large number of RLC data PDUs are not transmitted by the NodeB1, and the NodeB2 has already transmitted the RLC data PDUs with large sequence numbers to the UE 1. Indicating that the UE1 is likely to be waiting for data from the NodeB1, step S1510 is performed.
At step S1510, the RNC1 generates HS-DSCH capability request frames for the NodeB1 and NodeB2, respectively.
The RNC1 generates an HS-DSCH capability request frame with the sequence number 4 of the maximum ACK for NodeB1 according to the format of fig. 12, and sends it to NodeB1, where AckInd is 1 and Max Acked SN is 4; VT (A) Ind is 1 and VT (A) is 0.
The RNC1 generates an HS-DSCH capability request frame with the sequence number 45 of the maximum ACK of NodeB2 according to the format of fig. 12, and sends it to NodeB1, where AckInd is 1 and Max Acked SN is 45; VT (A) Ind is 1 and VT (A) is 0.
In step S1512, the NodeB1 and the NodeB2 accelerate or decelerate Transmission Time Interval (TTI) data Transmission amount according to their own conditions.
When confirming that the resources of other low-priority users can be preempted currently, the NodeB1 increases the data transmission amount per TTI, thereby speeding up the user data transmission of the UE 1.
The NodeB2 judges that the RLC data PDU sequence number confirmed by HARQ of other NodeBs is only 4, and if other users need to occupy resources, the user data transmission of the UE1 is properly slowed down;
in step S1514, the ACK received by the RNC1 for the UE is 64, which indicates that the UE1 has received all data.
Example three
The current scenario is now set as follows: RNC1 belongs to CN1 for management; NodeB1 and NodeB2 home RNC 1; CELL1 home NodeB1 management; CELL2 home NodeB2 management; CELL1 and CELL2 have a common coverage area; the UE1 resides in the common coverage area of CELL1 and CELL2 and is in HSDPA dual-flow state; the user data of UE1 in the RNC1 buffer has all been sent out and confirmed by UE1, and sequence number vt (a) of RNC1 waiting for confirmation by UE1 is 0.
Fig. 16 is a flowchart of the NodeB discarding data and instructing the RNC to retransmit, and the process includes steps S1602 to S1612.
In step S1602, the RNC1 receives the user data of the UE1 from the CN1 and divides the user data. The data are divided into sequence numbers 0-31 through RLC, and are averagely shunted to NodeB1 and NodeB2, namely data frames with sequence numbers 0-15 are sent to NodeB1, and data frames with sequence numbers 16-31 are sent to NodeB 2.
In step S1604, the NodeB1 and NodeB2 signal quality change, and state feedback information is transmitted to the RNC 1.
The NodeB1 sends the state feedback information as the signal deteriorates and the air interface continuously retransmits. And the NodeB1 sends the current state to the RNC1 through an HS-DSCH capability allocation frame, wherein AckInd in the HS-DSCH capability allocation frame is 1, and Max AckedSN is 4.
NodeB2, because of the better signaling, quickly acknowledges all data and sends a status report to RNC1 via the HS-DSCH capability allocation frame, where AckInd is 1 and Max Acked SN is 31.
In step S1606, after receiving the state feedback of the NodeB1 and the NodeB2, the RNC1 determines the sequence number of the current data transmitted by each NodeB, and determines the capability of the NodeB1 and the NodeB2 to transmit data according to the sequence number of the data to be transmitted.
After receiving the state feedback of NodeB1 and NodeB2, RNC1 determines that NodeB1 has 11 RLC data PDUs with small sequence numbers not sent yet, and NodeB2 has sent RLC data PDU with sequence number 31 to UE1, which indicates that UE1 is likely to wait for data of NodeB1, so sequence number 31 where NodeB2 is ACK at maximum is generated into an HS-DSCH capability request frame according to the format of fig. 12 and sent to NodeB1, where AckInd is 1 and Max Acked SN is 31; VT (A) Ind is 1 and VT (A) is 0.
In step S1608, the NodeB1 determines the content of the packet loss instruction notification based on its own capability of transmitting data in a short time, and transmits the instruction.
The NodeB1 judges that the data of 5 to 15 cannot be transmitted to the UE1 as soon as possible, and if the maximum RLC data PDU number that can be transmitted in a short time is 8, it notifies the RNC1 of an HS-DSCH packet loss instruction as shown in fig. 13, where dropbeginn is 1, dropendin is 0, and Dropped SN Begin is 9.
In step S1610, the RNC1 retransmits the 9 to 15 data to the NodeB2 after receiving the packet loss instruction notification.
In step S1612, the RNC1 then receives an ACK of 32 for the UE, which can indicate that the UE1 has received all data.
From the above description, it can be seen that the present invention achieves the following technical effects:
in the preferred embodiment, the RNC brings the RLC data PDU number waiting for the UE to acknowledge and the maximum RLC data PDU number that has been sent by other NodeB and obtained HARQ acknowledgement to the NodeB, which is equivalent to notifying the NodeB of the current RLC sliding window state, so that the NodeB can sense the imbalance degree of the current HSDPA multi-flow, and take corresponding improvement measures in time, thereby effectively improving the data throughput of the cell.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (23)

1. A data equalization method for shunting between base stations of high-speed downlink packet access HSDPA multi-stream is characterized by comprising the following steps:
the base station receives state feedback information of base stations participating in flow distribution among the base stations from a wireless network controller;
the base station adjusts the data sending capability of the base station according to the state feedback information;
wherein the status feedback information includes a largest rlc pdu number acknowledged by the arq.
2. The method of claim 1, wherein the base station receiving status feedback information from the radio network controller for base stations participating in inter-base station offloading comprises:
the base station receives state feedback information of all base stations participating in flow distribution among the base stations from the wireless network controller; or,
and the base station receives state feedback information of other base stations except the base station, which participate in the inter-base station shunting and come from the wireless network controller.
3. The method according to claim 2, before the base station receives the status feedback information of other base stations except the base station, which participate in inter-base station offloading from the radio network controller, further comprising:
and the base station sends the state feedback information to the wireless network controller, wherein the state feedback information comprises the sequence number of the largest Radio Link Control (RLC) data which is currently sent by the base station.
4. The method of claim 3, wherein before the base station sends the status feedback information to the radio network controller, the method further comprises:
and the radio network controller sends a high-speed downlink shared channel HS-DSCH data frame to each base station participating in the flow distribution among the base stations, wherein the HS-DSCH data frame carries RLC data and the sequence number of the RLC data.
5. The method of claim 4, wherein the HS-DSCH data frame carries an RLC data Protocol Data Unit (PDU) and an RLC data PDU sequence number, wherein the RLC PDU comprises an RLC data PDU.
6. The method of claim 5, wherein after the radio network controller transmits the HS-DSCH data frame to each base station participating in inter-base station offloading, further comprising:
and the base station analyzes a high-speed downlink shared channel (HS-DSCH) data frame from the wireless network controller, wherein the base station analyzes the RLC data PDU of the HS-DSCH data frame to obtain the RLC data PDU sequence number, or the base station analyzes the RLC data PDU sequence number of the HS-DSCH data frame to directly obtain the RLC data PDU sequence number.
7. The method of claim 5, wherein the base station sending status feedback information to the radio network controller comprises:
and the base station sends the maximum RLC data PDU sequence number which is sent and is confirmed by the hybrid automatic repeat request HARQ to the radio network controller through the HS-DSCH capability allocation frame.
8. The method of claim 7, wherein after the base station sends the status feedback information to the radio network controller, the method further comprises:
and the wireless network controller sends the state feedback information of the other base stations to the base stations.
9. The method of claim 8, wherein the radio network controller sending the status feedback information of the other base stations to the base station comprises:
the radio network controller judges whether the RLC data PDU with a large sequence number is already sent but the RLC data PDU with a small sequence number is not sent according to VT (A) and the largest RLC data PDU sequence number which is fed back by each base station participating in the flow distribution among the base stations and is confirmed by the HARQ;
and if so, sending the VT (A) and the maximum RLC data PDU sequence number which is fed back by the other base stations and confirmed by the HARQ to the base stations, wherein the VT (A) is the sequence number of the RLC data PDU which is waited to be confirmed by the User Equipment (UE) by the radio network controller.
10. The method of claim 4, wherein the base station adjusting the data transmission capability of the base station according to the status feedback information comprises:
the base station accelerates or decelerates the speed of sending the RLC protocol data unit PDU to the air interface; or discarding part of RLC data PDUs, and informing the radio network controller to retransmit the discarded RLC data PDUs, wherein the RLC PDUs comprise RLC data PDUs.
11. The method of claim 10, wherein the data transmission capability of the base station is adjusted according to the maximum RLC data PDU number of the base station and the status feedback information of the other base stations.
12. The method of claim 11, wherein the base station adjusts its data transmission capability in the following manner:
the base station judges whether the RLC data PDU with a large sequence number exists in the buffer memory of the base station and the RLC data PDU with a small sequence number exists in the buffer memory of the base station according to the VT (A) and the maximum RLC data PDU sequence number which is fed back by the other base station and is confirmed by the hybrid automatic repeat request HARQ;
if the number of the RLC data PDUs is the same as the preset number, the data transmission capability of the base station is adjusted according to the condition of the occupiable resources, wherein the RLC data PDUs with small sequence numbers in the buffer of the base station are sent in an accelerated manner under the condition of the occupiable resources, part of the RLC data PDUs are discarded under the condition of no occupiable resources, and the radio network controller is informed to retransmit the discarded RLC data PDUs, wherein VT (A) is the sequence number of the RLC data PDUs which are waited to be confirmed by user equipment UE by the radio network controller.
13. The method of claim 11, wherein the base station adjusts its data transmission capability in the following manner:
the base station judges whether the maximum RLC data PDU serial number which is confirmed by the HARQ of the other base station is very small or not according to VT (A) and the maximum RLC data PDU serial number which is fed back by the other base station and is confirmed by the hybrid automatic repeat request HARQ, but the base station sends the RLC data PDU with the large serial number;
if yes, and meeting the preset condition, slowing down the sending speed of the RLC data PDU to an air interface, wherein the VT (A) is a sequence number of the RLC data PDU which is waited by the wireless network controller and confirmed by the user equipment UE.
14. The method of claim 12, wherein after the base station discards partial RLC data PDUs and notifies the radio network controller to retransmit the discarded RLC data PDUs, further comprising:
and the wireless network controller retransmits the RLC data PDU discarded by the base station according to the packet loss instruction of the base station.
15. The method of claim 4, wherein the HS-DSCH DATA FRAME comprises at least one of: HS-DSCH type 1 data frame and HS-DSCH type 2 data frame.
16. The method of claim 3, wherein the RLC mode is an acknowledged AM mode.
17. A base station, comprising:
the receiving module is used for receiving state feedback information of base stations participating in flow distribution among the base stations from the wireless network controller;
the adjusting module is used for adjusting the data sending capability of the base station according to the state feedback information;
wherein the status feedback information includes a largest rlc pdu number acknowledged by the arq.
18. The base station of claim 17, further comprising:
and a sending module, configured to send the status feedback information to the radio network controller, where the status feedback information includes a sequence number of the largest RLC data that has been currently sent by the base station.
19. The base station of claim 18, further comprising:
and the analysis module is used for analyzing a high-speed downlink shared channel (HS-DSCH) data frame from the wireless network controller, wherein the base station analyzes the RLC data PDU of the HS-DSCH data frame to obtain the RLC data PDU sequence number, or the base station analyzes the RLC data PDU sequence number of the HS-DSCH data frame to directly obtain the RLC data PDU sequence number.
20. A radio network controller, comprising:
the receiving module is used for receiving state feedback information from each base station participating in flow distribution among the base stations;
a first sending module, configured to send the state feedback information of other base stations except a first base station in each base station to the first base station;
wherein the status feedback information includes a largest rlc pdu number acknowledged by the arq.
21. The rnc of claim 20, further comprising:
and the second sending module is used for sending a high-speed downlink shared channel HS-DSCH data frame to each base station participating in the flow distribution among the base stations, wherein the HS-DSCH data frame carries Radio Link Control (RLC) data and the sequence number of the RLC data.
22. The rnc of claim 21, further comprising:
and the retransmission module is used for retransmitting the RLC data PDU discarded by the first base station according to the lost packet indication of the first base station.
23. A data equalization system for shunting between base stations of high speed downlink packet access HSDPA multi-streaming is characterized by comprising the following steps: the base station of any of claims 17 to 19 and the radio network controller of any of claims 20 to 22.
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