WO2014180384A1

WO2014180384A1 - Method and terminal for controlling single transmission throughput of hsdpa data channel

Info

Publication number: WO2014180384A1
Application number: PCT/CN2014/078169
Authority: WO
Inventors: 魏建刚; 吴利予
Original assignee: 中兴通讯股份有限公司
Priority date: 2013-10-08
Filing date: 2014-05-22
Publication date: 2014-11-13
Also published as: CN104518848A

Abstract

A method and terminal for controlling single transmission throughput of a high speed downlink packet access (HSDPA) data channel. The method comprises: counting a condition of error packets which are transmitted over an HSDPA data channel; and controlling single transmission throughput according to the condition of the error packets. By means of the embodiments of the present invention, the block error rate (BLER) of HSDPA services can be effectively controlled, and the HSDPA transmission performance and stability of a terminal system can be effectively improved; and great protection values are provided to the commercial design of the terminal system.

Description

Method and terminal for controlling single transmission throughput of HSDPA data channel

Technical field

The present invention relates to the field of communications, and in particular to a method and a terminal for controlling a single transmission throughput of a HSDPA (High Speed Downlink Package Access) data channel.

Background technique

With the development of mobile communication technology, mobile communication wireless service reliability requirements of increasingly high, HSDPA technology is the key technology to achieve high-speed downlink, 3G (3 ^M Generation, third generation mobile communications) and 4G maximum HSDPA (High Speed Downlink Package Access, high-speed downlink packet access) download rate can reach several Mbps, even tens of Mbps, HSPA+ (High Speed Packet Access) is even higher, mainly to meet existing voice and data Multi-service concurrency, adapt to the needs of the upper multi-class application scenarios.

This article uses TD-SCDMA (Time Division- Synchronous Code Division Multiple)

Access, Time Division Synchronous Code Division Multiple Access) In the mobile system, the HSDPA function is described. The WCDMA (Wideband Code Division Multiple Access) and LTE (Long Term Evolution) principles are similar. No longer. The HSDPA completes the control of the uplink and downlink by the corresponding physical channel, and mainly includes the following channels: HS-DSCH (High Speed Downlink Shared Channel), HS-SCCH (Shared Control Channel for HS-DSCH, HS- DSCH shared control channel), HS-SICH (Shared Information Channel for HS-DSCH, HS-DSCH shared information channel).

The main timings of HSDPA terminal and network side interaction in the TD-SCDMA standard include:

1. The terminal obtains the network side indication to monitor the HS-SCCH channel; and the HS-SCCH control message informs the physical resource allocation of the HS-DSCH data packet;

2. Upon receiving the correct HS-SCCH of the CRC (Cyclic Redundancy Check), the terminal will read the HS-DSCH information corresponding to the HS-SCCH; and obtain the CQI through the HS-DSCH channel measurement ( Channel quality indication) information; 3. After receiving the HS-DSCH, the terminal will generate an ACK (Acknowledgement)/NACK (Negative Acknowledgement) message and together with the CQI (Channel Quality Indicator) information obtained by the evaluation. HS-SICH (Shared Information Channel for HS-DSCH, HS-DSCH shared information channel) is sent to the network side; the network-side higher layer selects the next transmission period HS-DSCH data modulation scheme and appropriate by using the received CQI information. Transmission rate.

In a wireless environment, the number of intra-frequency users, the strength of the service 4 signal, and the channel fading model are not fixed. Therefore, there is uncertainty in the interference of the user data channel, and different interference conditions may result in different channel conditions. The estimation that caused the channel quality indication of the user is not accurate. Summary of the invention

The technical problem to be solved by the present invention is to provide a control method and terminal for a single transmission throughput of an HSDPA data channel, so as to improve channel throughput.

In order to solve the above technical problem, the present invention provides a method for controlling a single transmission throughput of an HSDPA data channel, including:

Counting the error packets transmitted on the HSDPA data channel;

The single transmission throughput is controlled according to the condition of the error packet.

Preferably, the foregoing method further has the following features: the controlling the single transmission throughput according to the situation of the error packet, including:

If the number of consecutive erroneous error packets reaches the specified value during the statistical period, or the ratio of the error packets reaches the specified threshold during the statistical period, the recommended transport block size level is lowered.

After the statistical period is reached, the error packet rate in the entire statistical period is calculated;

The recommended transport block size level is adjusted according to the error packet rate.

Preferably, the foregoing method further has the following features: the adjusting the recommended transport block size level according to the error packet rate includes: If the error packet rate is greater than or equal to the falling threshold, the recommended transport block size is reduced; if the error packet rate is less than or equal to the rising threshold, the recommended transport block size is increased, and the rising threshold is less than Describe the threshold.

Preferably, the method further has the following features: after the adjusting the recommended transport block size according to the error packet rate, the method further includes:

The adjustment range of the level of the next statistical period and/or the recommended transport block size is adjusted according to the error packet rate.

In order to solve the above problems, the present invention further provides a terminal, including:

The statistics module is configured to: count the case of error packets transmitted on the High Speed Downlink Packet Access (HSDPA) data channel;

The control module is configured to: control a single transmission throughput according to the condition of the error packet. Preferably, the terminal further has the following features:

The control module is configured to: if the number of consecutive error packets reaches the specified value in the statistical period, or the ratio of the error packets reaches the specified threshold in the statistical period, the recommended size of the transport block is reduced.

Preferably, the terminal further has the following features:

The control module is configured to: after reaching the statistical period, calculate an error packet rate in the entire statistical period; and adjust a recommended transport block size level according to the error packet rate.

Preferably, the terminal further has the following features:

The control module is configured to: adjust a level of the recommended transport block size according to the error packet rate, including: if the error packet rate is greater than or equal to a falling threshold, lowering a recommended transport block size level; If the rate is less than or equal to the rising threshold, the recommended level of the transport block size is increased, and the rising threshold is less than the falling threshold.

Preferably, the terminal further has the following features:

The control module is configured to: after adjusting a level of the recommended transport block size according to the error packet rate, further comprising: adjusting an adjustment level of a level of a next statistical period and/or a recommended transport block size according to the error packet rate . In summary, the embodiment of the present invention provides a method and a terminal for controlling a single transmission throughput of an HSDPA data channel, which can effectively control a BLER (Block Error Rate) of the HSDPA service, and effectively improve the transmission performance of the terminal system HSDPA and Stability; Great protection for the commercial design of end systems. BRIEF abstract

1 is a flowchart of a method for controlling a single transmission throughput of an HSDPA data channel according to an embodiment of the present invention;

2 is a flowchart of a method for controlling a single transmission throughput of an HSDPA data channel according to an application example of the present invention;

FIG. 3 is a schematic diagram of a terminal according to an embodiment of the present invention. Preferred embodiment of the invention

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the features in the embodiments and the embodiments in the present application may be arbitrarily combined with each other.

When receiving the HS-DSCH of the user, the terminal performs CQI estimation. The purpose of the control is to obtain the maximum single transmission throughput under the premise that the BLER is not more than 10%.

The BLER is defined as the probability of error when the first transmission block transmitted by RTBS (Beet transmit block size, recommended transport block size) is decoded separately. According to the definition of BLER, the single transmission throughput is defined as follows:

Single transmission throughput = (1 - BLER) X RTBS;

Therefore, it can be seen that the key to single throughput is to control the balance between BLER and RTBS: Reduce BLER to avoid retransmission; Improve RTBS in reported CQI information as much as possible.

FIG. 1 is a flowchart of a method for controlling a single transmission throughput of an HSDPA data channel according to an embodiment of the present invention. As shown in FIG. 1, the method in this embodiment includes:

Step 11. Count the error packets transmitted on the HSDPA data channel;

Step 12: Control a single transmission throughput according to the condition of the error packet. FIG. 2 is a schematic diagram of a method for controlling a single transmission throughput of an HSDPA data channel according to an application example of the present invention; FIG. 2 is a schematic diagram, as shown in FIG.

Step 101: Count the count of HSDPA packet errors;

Step 102: Determine whether the continuous error exceeds the threshold, if the threshold is not exceeded, then go to step 103; if the threshold is exceeded, go to step 108;

Step 103: Determine whether the statistical period is reached, and if yes, go to step 104; otherwise, go to step

106;

Step 104: Determine whether the error rate is lower than the upper threshold, if yes, go to step 105, otherwise go to step 106;

Step 105, raise the RTBS level, and then perform step 109;

Step 106, determining whether the error rate is higher than the lowering threshold, if it is higher, then proceed to step 107; otherwise, go to step 109;

Step 107, lowering the RTBS level, and then performing step 109;

Step 108, lowering the RTBS level, and then performing step 109;

Step 109: Reset the statistics period and reset the packet error count.

According to the method of the embodiment of the invention, the throughput of the HSDPA can be significantly increased by 10%, or even higher, and the stability is also steadily improved. The main beneficial effects are as follows:

Overcome some large-scale decoding errors and link interruptions in some harsh environments.

The cell has more co-channel interference, especially the same time slot may have different users accessing at the same time. The HS-DSCH of the user in this embodiment is not uniform and inaccurate due to differences in the scenarios of the wireless environment. Therefore, when there is interference, the HS-DSCH BLER is too large; even if the link is disconnected, the user's communication experience is abnormal and the flow is not smooth. The BLER of the HSDPA service can be effectively controlled by the method of the embodiment of the present invention, and the physical layer channel data is prevented from being multi-transmitted.

By adjusting the threshold and evaluation period, the fast convergence and dynamic adaptation of the bit error rate and decoding performance can be achieved, and the BLER can be controlled to be 10% or less, which is beneficial to the rapid establishment and stability of the transmission. The HSDPA of the embodiment of the present invention uses a network-side dynamic HARQ (Hybrid Automatic Repeat Request) scheduling mechanism to ensure that the terminal quickly passes the channel quality RTBS of the HS-DSCH, and the network side can dynamically adjust the network dynamically. The resources of the side data block can reduce the BLER, so that after the allocation of the overall network resources, most of them are effectively used, and the utilization of the physical resources allocated by the network side is greatly improved. For tens of millions of users, the overall throughput of the network will be greatly improved, and both terminals and networks will benefit.

In summary, through the control method of the embodiment of the present invention, the BLER and the RTBS index are comprehensively balanced, the channel throughput rate is generally improved, and the response of the actual channel environment change is overcome.

The terminal normally detects the HS-DSCH channel CQI; in a certain statistical period, it is agreed to T transmission packets, and after the arrival of the statistical period, the HS-DSCH channel statistical error rate of HSDPA is defined and counted as BLER=Err_Cnt/T Statistical transmission package. Define the number of error packets in the statistical period as Err Cnt; define the number of consecutive error packets as Continue— Err—Cnt.

According to the distribution of error conditions:

The Threshold Up is defined as TH UP, and the Threshold Down is abbreviated as TH_DOWN; the value is 0-1; in the following description, it generally appears as a percentage. For example: TH-UP can take 15%. TH—UP is less than TH—DOWN.

Adjust immediately after a continuous error, or an error within a statistical period, reaches a certain threshold:

RTBS'=RTBS-delta;

c) Make adjustments after the statistical period has arrived. The RTBS is taken as the recommended channel size for the channel to be reported initially, and the RTBS' is the actual reported value adjusted according to the BLER result. The BLER is distributed under different thresholds, and the channel quality reported by the policy adjustment is timely:

among them:

When BLER>=TH_DOWN: RTBS,=RTBS-delta;

When BLER<=TH—UP: RTBS,=RTBS+delta;

When TH UP < BLER <TH_DOWN: RTBS, =RTBS;

Where delta is the adjustment range;

The set of parameters recommended by the above strategy is as follows: T takes 100 HSDPA packets;

Continue— Err—Cnt has a threshold of 5;

TH-UP is 4%;

The TH-DOWN threshold is 10%;

The adjustment delta is 1.

In addition, in view of adjusting the threshold of continuous reception error (Continue- Err-Cnt), the BLER in the case of many errors can be quickly converged; different error thresholds can be dynamically set according to the BLER;

In the case of non-continuous error adjustment, since the statistical period is long, it is a slow adjustment. Therefore, in order to speed up the discontinuous error adjustment rate, dynamic parameters can be used for adjustment. For example: According to the BLER, several parameters can be set to dynamically adjust the statistical period T according to the parameters of different BLERs, which can meet the convergence speed requirements in each scenario. E.g:

a. BLER>=2*TH_DOWN in the statistical period, the statistical period is shortened to 20 packets; b. BLER<=TH_UP in the statistical period, the statistical period is set to 100 packets; c. Statistical period TH_UP<BLER<2*TH_DOWN inside, the statistical period is 50 packets. For different RTBS values, the corresponding code rate is different, so the probability of error is not the same, and the smaller the general block, that is, the CQI is about, the higher the data rate, the higher the error rate. Therefore, it is also possible to dynamically configure the adjustment statistical period T and the thresholds TH_UP, TH_DOWN according to the segmentation of the CQI value. It is also possible to accelerate or slow down the BLER adjustment speed by increasing the delta amplitude. E.g:

The initial statistical period T takes 100 transmissions;

Continue— Err—Cnt has a threshold of 5;

In the statistical period, the CQI of all data blocks is accumulated and averaged as the average CQI, the average CQI selected block rate is >0.8 code rate, and TH_UP is 4%; if the average CQI is <=0.8 code rate, TH_UP is 6 %; that is, when the code rate is high, the probability of CQI rising increases;

The TH DOWN threshold is 10%;

The default adjustment delta is 1.

Each time the statistical period is reached, the BLER calculation is performed and the parameters are adjusted:

1. The threshold of Continue Err Cnt is still set to 5; 2. BLER>=2*TH_DOWN in the statistical period, set the next statistical period T to 20 times, and delta to 2;

TH— DOWN<=BLER<2*TH— DOWN in the statistical period, set the next statistical period to 50 times, and delta to 2;

TH_UP<BLER<TH_DOWN in the statistical period, set the next statistical period to 100 times, and delta to 1;

BLER<=TH_UP in the statistical period, set the next statistical period to 100 times; delta is set to 1;

3. If the average CQI selects the block rate >0.8 code rate, TH_UP is 4%; the average CQI<=0.8 code rate, and TH_UP is 6%.

HSDPA technologies in TD-SCDMA, WCDMA, and LTE all use similar principles, and similar strategies can be used to control and reduce the BLER of HSDPA.

FIG. 3 is a schematic diagram of a terminal according to an embodiment of the present invention. As shown in FIG. 3, the terminal in this embodiment includes:

a statistics module, configured to calculate an error packet transmitted by the High Speed Downlink Packet Access (HSDPA) data channel;

And a control module, configured to control a single transmission throughput according to the condition of the error packet. In a preferred embodiment, the control module is specifically configured to reduce the recommended transmission if the number of consecutive error packets reaches a specified value during a statistical period, or when the ratio of the error packets reaches a specified threshold in the statistical period. The level of the block size.

In a preferred embodiment, the control module is specifically configured to calculate an error packet rate in the entire statistical period after the statistics period is reached; and adjust the recommended transport block size level according to the error packet rate.

The determining, by the control module, the recommended level of the transport block size according to the error packet rate, includes: if the error packet rate is greater than or equal to a falling threshold, lowering a recommended transport block size level; If the threshold is less than or equal to the rising threshold, the recommended level of the transport block size is increased, and the rising threshold is smaller than the falling threshold.

The control module adjusts a recommended transport block size according to the error packet rate. The level further includes: adjusting the adjustment range of the level of the next statistical period and/or the recommended transport block size according to the error packet rate.

One of ordinary skill in the art will appreciate that all or a portion of the above steps may be accomplished by a program instructing the associated hardware, such as a read-only memory, a magnetic disk, or an optical disk. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the above embodiment may be implemented in the form of hardware or in the form of a software function module. The invention is not limited to any specific form of combination of hardware and software.

The above is only a preferred embodiment of the present invention, and of course, the present invention may be embodied in various other embodiments without departing from the spirit and scope of the invention. Corresponding changes and modifications are intended to be included within the scope of the appended claims.

Industrial applicability

The embodiment of the invention provides a control method and a terminal for the HSDPA data channel single-transmission throughput, which can effectively control the BLER (Block Error Rate) of the HSDPA service, and effectively improve the transmission performance and stability of the terminal system HSDPA; It has great protection value for the commercial design of the terminal system.

Claims

claims

1. A method for controlling the single transmission throughput of a High Speed Downlink Packet Access (HSDPA) data channel, including:

Statistics on error packets transmitted on the HSDPA data channel;

The single transmission throughput is controlled according to the error packet situation.

2. The method of claim 1, wherein the controlling the single transmission throughput according to the error packet includes:

If the number of consecutive error packets within the statistical period reaches the specified value, or the proportion of error packets within the statistical period reaches the specified threshold, the recommended transmission block size level will be reduced.

3. The method of claim 1, wherein the controlling the single transmission throughput according to the error packet includes:

After reaching the statistical period, calculate the error packet rate during the entire statistical period;

Adjust the level of recommended transport block sizes based on the packet error rate.

4. The method of claim 3, wherein the adjusting the level of the recommended transport block size according to the error packet rate includes:

If the error packet rate is greater than or equal to the decreasing threshold, the level of the recommended transport block size is reduced; if the error packet rate is less than or equal to the rising threshold, the level of the recommended transport block size is raised, and the rising threshold is less than the level of the recommended transport block size. Describe the falling threshold.

5. The method of claim 3, wherein, after adjusting the level of the recommended transport block size according to the error packet rate, the method further includes:

Adjust the adjustment range for the next statistical period and/or the level of the recommended transport block size based on the packet error rate.

6. A terminal, including:

The statistics module is set to: count the error packets transmitted on the High Speed Downlink Packet Access (HSDPA) data channel;

The control module is configured to: control the single transmission throughput according to the error packet.

7. The terminal according to claim 6, wherein, The control module is set to: If the number of consecutive error packets within the statistical period reaches a specified value, or the proportion of error packets within the statistical period reaches a specified threshold, then reduce the level of the recommended transmission block size.

8. The terminal as claimed in claim 6, wherein,

The control module is set to: after reaching the statistical period, calculate the error packet rate during the entire statistical period; adjust the recommended transmission block size level according to the error packet rate.

9. The terminal according to claim 8, wherein,

The control module is configured to: adjust the level of the recommended transport block size according to the error packet rate, including: if the error packet rate is greater than or equal to the reduction threshold, then reduce the level of the recommended transport block size; if the error packet rate If the rate is less than or equal to the rising threshold, the level of the recommended transport block size is increased, and the rising threshold is smaller than the falling threshold.

10. The terminal according to claim 8, wherein,

The control module is configured to: after adjusting the level of the recommended transport block size according to the error packet rate, it also includes: adjusting the adjustment range of the next statistical period and/or the level of the recommended transport block size according to the error packet rate. .