WO2012055341A1

WO2012055341A1 - Method and device for data retransmission adjustment, and base station

Info

Publication number: WO2012055341A1
Application number: PCT/CN2011/081212
Authority: WO
Inventors: 冯涵; 余晶鑫
Original assignee: 华为技术有限公司
Priority date: 2010-10-25
Filing date: 2011-10-25
Publication date: 2012-05-03
Also published as: CN101958781A

Abstract

A method and a device for data retransmission adjustment, and a base station are provided by the embodiments of the present invention. The method comprises: receiving downlink channel characteristic measurement information reported by a user equipment (UE); judging whether the UE is in an enhanced Cell Forward Access Channel (Cell FACH) state or not, and if the UE is in the enhanced Cell FACH state, adjusting data retransmission times according to the downlink channel characteristic measurement information. In the embodiments of the present invention, the data retransmission times are self-adaptively adjusted according to the downlink channel characteristic measurement information reported by the UE, so that the base station can properly reduce the data retransmission times when the downlink channel quality is good and properly increase the data retransmission times when the downlink channel quality is poor, and thus not only the reliability of the data transmission is guaranteed, but also the data transmission efficiency is improved.

Description

Method, device and base station for data retransmission adjustment The present application claims to be Chinese patent issued on October 25, 2010, with the application number of 201010518537.9, and the invention titled "a data retransmission adjustment method, device and base station" Priority of the application, the entire contents of which are incorporated herein by reference. Technical field

The present invention relates to the field of communications, and in particular, to a data retransmission adjustment method, apparatus, and base station. Background technique

The current Wideband Code Division Multiple Access (WCDMA) system defines the state of the user equipment (User Equipment, UE) as an idle state and a connection mode according to a Radio Resource Control (RRC) connection mode. status. The connection mode state includes a Cell Dedicated Channel (Cell DCH) state and a Cell Forward Access Channel (Cell FACH) state.

In the traditional Cell FACH state, the downlink data rate of the UE is usually less than 32 Kbps. When a small file is downloaded, it is usually required to switch to the Cell DCH state and then receive the data, so that there is a state transition delay of the downlink data transmission.

In response to the above drawbacks, the R7 protocol introduces an enhanced Cell FACH function, which enables a UE in a Cell FACH state to share downlink code resources and power resources with a UE in a Cell DCH state, and the data rate can reach or exceed 1 Mbps. When a small file is downloaded, there is no need to switch to the Cell DCH state, and data reception can be directly performed in the Cell FACH state, thereby reducing the state transition delay of the downlink data transmission. However, since the UE in the enhanced Cell FACH state does not feed back acknowledgment/non-acknowledgement (ACK/NACK) information and channel quality indicator (CQI, Channel Quality Indicator) to the WCDMA base station (Node B) in the uplink transmission, the Node B The reliability of downlink data transmission can only be improved by setting a fixed number of downlink retransmissions, and the transmission efficiency of the downlink data transmission method is much worse than the downlink data transmission in the Cel 1 DCH state. Summary of the invention

The embodiment of the invention provides a data retransmission adjustment method, device and base station, which are used for improving downlink data transmission efficiency in an enhanced Cell FACH state.

In an aspect, the embodiment of the present invention provides a data retransmission adjustment method, where the method includes: receiving downlink channel characteristic measurement information reported by a user equipment; determining whether the user equipment is in an enhanced Cell FACH state, and if in an enhanced Cel 1 FACH state, And adjusting the number of data retransmissions according to the downlink channel characteristic measurement information.

On the other hand, the embodiment of the present invention further provides a data retransmission adjustment apparatus, including: a receiving unit, configured to receive downlink channel characteristic measurement information reported by a user equipment; and a determining unit, configured to determine whether the user equipment is in an enhanced Cell FACH The adjusting unit is configured to: when the determining unit determines that the user equipment is in the enhanced Cell FACH state, adjust the number of data retransmissions according to the downlink channel characteristic measurement information received by the receiving unit.

In another aspect, embodiments of the present invention also provide a base station that includes the apparatus as described above.

The embodiment of the present invention adaptively adjusts the number of data retransmissions according to the downlink channel characteristic measurement information reported by the user equipment, so that the base station can appropriately reduce the number of retransmissions when the downlink channel quality is good, and may be appropriate when the downlink channel quality is poor. Increasing the number of retransmissions not only ensures the reliability of data transmission, but also improves data transmission efficiency. DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only the present invention. For some embodiments, other drawings may be obtained from those skilled in the art without any inventive labor.

1 is a schematic flowchart of a data retransmission adjustment method according to an embodiment of the present invention; FIG. 2 is a schematic flowchart of another data retransmission adjustment method according to an embodiment of the present invention; FIG. 4 is a schematic structural diagram of another data retransmission adjustment apparatus according to an embodiment of the present invention; FIG. 5 is a schematic structural diagram of a base station according to an embodiment of the present invention. detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

FIG. 1 is a schematic flow chart of a data retransmission adjustment method according to an embodiment of the present invention. It should be noted that the present embodiment describes the present invention in a WCDMA system. Correspondingly, in this system, the base station is a Node B. In fact, the technical solution provided by the embodiment of the present invention can also be applied to other systems, such as a TD-SCDMA (Time Divi s ion-Synchronous Code Divi s ion Mul t ip le Acces s, time division synchronous code division multiple access) system, and the like. . Taking WCDMA as an example, the method includes:

S101: Receive downlink channel characteristic measurement information reported by the user equipment.

In WCDMA, user equipments in different connection modes perform downlink channel characteristics. Measure and feed back the resulting measurement report to Node B.

The specific implementation manner may be: the user equipment first carries the measurement report on a Random Access Channel (RACH), and then sends the measurement report to the wireless network control in the form of a Radio Resource Control (RRC) message. (Radio Network Controller, RNC), the RNC then carries the characteristic measurement information in the above measurement report to the Node B through the lub interface data frame.

As an embodiment of the present invention, the characteristic measurement information may include a signal to noise ratio (Ec/No, Received energy per chip divided by the power density in the band) value and a Received Signal Code Power (RSCP). Value, both of these values can characterize the downstream channel quality. The Ec/No value reflects the signal-to-noise ratio of the user equipment receiving channel, and the RSCP value reflects the strength of the received signal of the user equipment.

As another embodiment of the present invention, the base station may directly receive the downlink channel characteristic measurement information reported by the user equipment, and complete the following steps by using related information in the downlink channel measurement information.

S102: Determine whether the user equipment is in the enhanced Cell FACH state, if it is in the enhanced Cell

In the FACH state, the process proceeds to step S103. Otherwise, the algorithm is processed according to the CELL DCH state.

Since the user equipment is in different connection mode in WCDMA, the downlink channel characteristic measurement information is sent to the Node B. Therefore, in this embodiment, the connection mode currently in which the user equipment is located can be determined. As an embodiment of the present invention, whether the user equipment is in the enhanced Cell FACH state may be determined by: when receiving the downlink channel characteristic measurement information, the Node B determines whether the corresponding user is the data queue according to whether the data queue is a public queue or a dedicated queue. Enhance the Cell FACH state or the Cell DCH state.

S103: Adjust the number of data retransmissions according to the received downlink channel characteristic measurement information.

In the embodiment of the present invention, the Node B receives the downlink channel characteristic measurement information, and can determine the quality of the downlink channel according to the information, and then adjust the number of data retransmissions. Such as when going down When the channel quality is good, the number of data retransmissions can be appropriately reduced. When the quality of the downlink channel is not good, the number of data retransmissions can be appropriately increased. When the quality of the downlink channel is good (correspondingly, the data quality is good), even You can set the number of data retransmissions to zero, that is, do not retransmit.

The embodiment of the invention adaptively adjusts the number of data retransmissions according to the downlink channel characteristic measurement information reported by the user equipment, which not only ensures the reliability of data transmission, but also improves data transmission efficiency.

FIG. 2 is a schematic flowchart diagram of another data retransmission adjustment method according to an embodiment of the present invention, where the method includes:

S201: Receive downlink channel characteristic measurement information reported by the user equipment.

The downlink channel characteristic measurement information may be an Ec/No value and an RSCP value.

S202: Determine whether the user equipment is in the enhanced Ce l l FACH state, and if in the enhanced Ce l l FACH state, proceed to step S203; otherwise, according to the CELL DCH state, the algorithm is processed.

Steps S201-S202 are similar to the above steps S 1 01-S 1 02, and are not mentioned here.

S203: Compare the Ec/No value with the preset Ec/No threshold, and/or compare the RSCP value with the preset RSCP threshold.

In the embodiment of the present invention, the Node B end can preset the Ec/No threshold and the RSCP threshold simultaneously, and the downlink channel quality is determined by comparing the received Ec/No value and the RSCP value with a preset value. Bad. In addition, in the embodiment of the present invention, only the Ec/No threshold value may be preset, or only the RSCP threshold value is preset, and the quality of the downlink channel is determined according to a single judgment.

S204: Adjust the number of data retransmissions according to the comparison result.

In the embodiment of the present invention, it is assumed that when only the Ec/No value is compared with the preset Ec/No threshold value in step S203, the method for adjusting the number of data retransmissions in the embodiment of the present invention may be as follows: The result is Ec/No value > Ec/No threshold, then the number of data retransmissions is set to a, otherwise it is set to b;

Alternatively, multiple Ec/No thresholds, such as the first Ec/No, may also be preset in the embodiment of the present invention. Threshold and second Ec/N. Threshold, and the first Ec/N. Threshold value> second Ec/N. Threshold, at this time:

If the comparison result is Ec/No value> first Ec/No threshold, the number of data retransmissions is set to a;

If the comparison result is the second Ec/No threshold Ec/No value, the first Ec/No threshold sets the number of data retransmissions to b;

If the comparison result is the Ec/No value <second Ec/No threshold, set the number of data retransmissions to c.

In the other case, it is assumed that when only the RSCP value is compared with the preset RSCP threshold value in step S203, it can be referred to the case where only the Ec/No value is compared.

In another case, it is assumed that when the Ec/No value is compared with the preset Ec/No threshold value and the RSCP value is compared with the preset RSCP threshold value in step S203, the embodiment of the present invention is The adjustment method of the number of data retransmissions can be as follows:

If the comparison result in step S203 is Ec/No value> Ec/No threshold value and RSCP value> RSCP threshold value, the number of data retransmission times is set to a;

Otherwise, if only Ec/No value > Ec/No threshold or RSCP value > RSCP threshold is met, the number of data retransmissions is set to b;

If the above is not satisfied, set the number of data retransmissions to c;

Where a<b<c , and &, b, c are integers greater than or equal to zero, such as a is 1 , b is 2 , and c is 3. It is mainly necessary to judge the quality of the channel according to the comparison result, thereby setting the number of data retransmissions according to the quality of the channel, so as to achieve the purpose of improving data transmission efficiency.

The embodiment of the present invention adaptively adjusts the number of data retransmissions according to the downlink channel characteristic measurement information reported by the user equipment, so that the base station can appropriately reduce the retransmission when the downlink channel quality is good. The number of retransmissions can be appropriately increased when the quality of the downlink channel is poor, which not only ensures the reliability of data transmission, but also improves the data transmission efficiency.

FIG. 3 is a schematic structural diagram of a data retransmission adjustment apparatus according to an embodiment of the present invention. The apparatus may be a functional unit in a Node B, and the apparatus includes: a receiving unit 310, a determining unit 320, and an adjusting unit 330. The determining unit 320 is connected to the receiving unit 310 and the adjusting unit 330, respectively.

The receiving unit 310 is configured to receive downlink channel characteristic measurement information reported by the user equipment.

In WCDMA, user equipments in different connection modes perform downlink channel characteristics measurement and feed the obtained measurement reports to Node B. Specifically, the user equipment first carries the measurement report on the RACH, and then sends the measurement report to the RNC in the form of an RRC message, and the RNC carries the characteristic measurement information in the measurement report to the Node B through the lub interface data frame. Of course, in the embodiment of the present invention, the Node B can directly receive the downlink channel measurement information reported by the user equipment, and complete the solution of the present invention according to the downlink channel measurement information.

As an embodiment of the present invention, the above characteristic measurement information may include an Ec/No value and an RSCP value, both of which may represent a downlink channel quality condition. The Ec/No value reflects the signal-to-noise ratio of the user equipment receiving channel, and the RSCP value reflects the strength of the received signal of the user equipment.

The determining unit 320 is configured to determine whether the user equipment is in the enhanced Ce l l FACH state.

In the WCDMA, the user equipment is in different connection mode, and the downlink channel characteristic measurement information is sent to the Node B. Therefore, in this embodiment, the connection mode currently in which the user equipment is located needs to be determined. As an embodiment of the present invention, It is determined whether the user equipment is in the enhanced Ce ll FACH state by the following manner: When receiving the downlink channel characteristic measurement information, the determining unit 320 determines whether the corresponding user is an enhanced Ce ll FACH state or a Ce according to whether the data queue is a public queue or a dedicated queue. Ll DCH status.

The adjusting unit 330 is configured to: when the determining unit 320 determines that the user equipment is in the enhanced Ce ll FACH In the state, the number of data retransmissions is adjusted according to the downlink channel characteristic measurement information.

In the embodiment of the present invention, after receiving the downlink channel characteristic measurement information, the adjusting unit 330 may determine the quality of the downlink channel according to the information, and then adjust the number of data retransmissions, for example, when the downlink channel quality is good, Reduce the number of data retransmissions; When the quality of the downlink channel is not good, you can increase the number of data retransmissions. When the data quality is good, you can even set the number of data retransmissions to zero, that is, no retransmission.

FIG. 4 is a schematic structural diagram of another data retransmission adjustment apparatus according to an embodiment of the present invention. The apparatus includes: a receiving unit 41 0, a determining unit 420, and an adjusting unit 430, where the adjusting unit 430 includes a comparing module 431 and Setting module 432.

The receiving unit 41 0 is configured to receive the downlink channel characteristic measurement information that is forwarded by the user equipment and is forwarded by the radio network controller, where the downlink channel characteristic measurement information may include an Ec/No value and an RSCP value, where the Ec/No value may reflect the user equipment receiving The signal-to-noise ratio of the channel, the RSCP value can reflect the strength of the received signal of the user equipment.

The determining unit 420 is configured to determine whether the user equipment is in the enhanced Ce l l FACH state.

The comparison module 431 is configured to compare the Ec/No value with a preset Ec/No threshold value, and/or compare the RSCP value with a preset RSCP threshold value.

In the embodiment of the present invention, the data retransmission adjustment apparatus may preset the Ec/No threshold and the RSCP threshold simultaneously, and determine the downlink channel by comparing the received Ec/No value and the RSCP value with a preset value. In addition, in the embodiment of the present invention, only the Ec/No threshold value or only the RSCP threshold value may be preset, and the quality of the downlink channel is determined according to a single judgment.

The setting module 432 is configured to set the number of data retransmissions according to the comparison result of the comparison module 431. In the embodiment of the present invention, it is assumed that when the comparison module 4 31 compares only the Ec/No value with the preset Ec/No threshold value, the setting module 432 can perform the following settings in the embodiment of the present invention: The comparison result of 431 is Ec/No value> Ec/No threshold, then the number of data retransmissions is set to a, otherwise it is set to b;

Or, in the embodiment of the present invention, a plurality of Ec/No thresholds, such as a first Ec/No threshold and a second Ec/N, may be preset. Threshold, and the first Ec/N. Threshold value> second Ec/N. The threshold value, at this time, the setting module 4 32 can be set as follows:

Assuming that the comparison module 431 only compares the RSCP value with the preset RSCP threshold value, it can be seen that the above only compares the Ec/No value.

Assuming that the comparison module 431 compares the Ec/No value with the preset Ec/No threshold value and compares the RSCP value with the preset RSCP threshold value, the setting module 432 can be performed as follows in the embodiment of the present invention. Settings:

If the comparison result of the comparison module 431 is Ec/No value> Ec/No threshold value and RSCP value> RSCP threshold value, the number of data retransmission times is set to a;

If the above is not satisfied, set the number of data retransmissions to c;

Where a<b<c , and &, b, c are all integers greater than zero, such as a is 1, b is 2, and c is 3. It is mainly necessary to judge the quality of the channel according to the comparison result, thereby setting the number of data retransmissions according to the quality of the channel, so as to achieve the purpose of improving data transmission efficiency.

The embodiment of the present invention adaptively adjusts the number of data retransmissions according to the downlink channel characteristic measurement information reported by the user equipment, so that the base station can appropriately reduce the number of retransmissions when the downlink channel quality is good, and may be appropriate when the downlink channel quality is poor. Increasing the number of retransmissions not only ensures the reliability of data transmission, but also improves data transmission efficiency.

FIG. 5 is a schematic structural diagram of a base station according to an embodiment of the present invention. The base station 500 may include a data retransmission adjustment apparatus 501, and the data retransmission adjustment apparatus 501 may perform the implementation as described in FIG. 3 or FIG. A data retransmission adjustment device is not described herein.

The base station according to the embodiment of the present invention can adjust the data retransmission times according to the downlink channel characteristic measurement information reported by the user equipment, which not only ensures the reliability of data transmission, but also improves the data transmission efficiency.

The embodiment of the invention further provides a communication system, comprising the above base station, and a radio network controller communicating with the base station.

In addition, the determination involved in the technical solution of the embodiment of the present invention may also be performed by the radio network controller, that is, the radio network controller performs retransmission times according to the downlink channel characteristic measurement information reported by the user equipment, and then The adjustment result informs the base station. Subsequent data transmission by the base station based on the adjusted number of retransmissions and the user equipment.

In addition, it should be noted that the technical features of the method embodiment, the device embodiment and the system embodiment of the present invention can be referred to each other and complement each other.

The above described specific embodiments of the present invention are further described in detail, and are intended to be illustrative of the embodiments of the present invention. Scope of protection, within the spirit and principles of the present invention, Any modifications, equivalent substitutions, improvements, etc., shall be included in the scope of protection of the present invention.

Claims

Rights request

A data retransmission adjustment method, the method comprising:

Receiving downlink channel characteristic measurement information reported by the user equipment;

Determining whether the user equipment is in the enhanced cell forward access channel Ce l l FACH state; if the user equipment is in the enhanced Ce l l FACH state, adjusting the number of data retransmissions according to the downlink channel characteristic measurement information.

2. The method according to claim 1, wherein the receiving the downlink channel characteristic measurement information reported by the user equipment comprises:

The downlink channel characteristic measurement information that is forwarded by the user equipment and transmitted by the radio network controller is received, or the downlink channel measurement information directly reported by the user is received.

The method according to claim 1 or 2, wherein the downlink channel characteristic measurement information comprises a cell signal to noise ratio Ec/No value and a received signal code power RSCP value.

The method according to claim 3, wherein the adjusting the number of data retransmissions according to the downlink channel characteristic measurement information comprises:

Comparing the Ec/No value with a preset Ec/No threshold value, and adjusting the number of data retransmissions according to the comparison result; or

Comparing the RSCP value with a preset RSCP threshold, and adjusting the number of data retransmissions according to the comparison result: or

The Ec/No value is compared with a preset Ec/No threshold value, and the RSCP value is compared with a preset RSCP threshold value, and the number of data retransmissions is adjusted according to the comparison result.

5. The method of claim 4, wherein

When comparing the Ec/No value with a preset Ec/No threshold, the adjusting the number of data retransmissions according to the comparison result includes:

If the comparison result is Ec/No value > Ec/No threshold, set the number of data retransmissions to a, Otherwise set to b;

Or,

When comparing the RSCP value with a preset RSCP threshold, the adjusting the number of data retransmissions according to the comparison result includes:

If the comparison result is RSCP value > RSCP threshold, set the number of data retransmissions to a, otherwise set to b;

Or,

When comparing the Ec/No value with a preset Ec/No threshold value, and comparing the RSCP value with a preset RSCP threshold value, the adjusting the data retransmission times according to the comparison result includes: The comparison result is Ec/No value> Ec/No threshold value and RSCP value> RSCP threshold value, then the number of data retransmission times is set to a;

If the above is not satisfied, set the number of data retransmissions to c;

Where a<b<c , and &, b, c are all integers greater than or equal to zero.

6. A data retransmission adjustment apparatus, comprising:

a receiving unit, configured to receive downlink channel characteristic measurement information reported by the user equipment, and a determining unit, configured to determine whether the user equipment is in an enhanced cell forward access channel Ce l l FACH state;

And an adjusting unit, configured to: when the determining unit determines that the user equipment is in the enhanced Ce l FACH state, adjust the number of data retransmissions according to the downlink channel characteristic measurement information received by the receiving unit.

The device according to claim 6, wherein the receiving unit is configured to receive downlink channel characteristic measurement information that is forwarded by the user equipment and is forwarded by the radio network controller, or It is used to receive downlink channel measurement information directly reported by the user.

The apparatus according to claim 6 or 7, wherein the downlink channel characteristic measurement information comprises a cell signal to noise ratio Ec/No value and a received signal code power RSCP value.

The device according to claim 8, wherein the adjusting unit comprises: a comparing module, configured to compare the Ec/No value with a preset Ec/No threshold; or The RSCP value is compared with a preset RSCP threshold; or

And comparing the Ec/No value with a preset Ec/No threshold value, and comparing the RSCP value with a preset RSCP threshold value;

And a setting module, configured to set a data retransmission times according to the comparison result of the comparison module.

A base station, characterized in that the base station comprises the apparatus according to any one of claims 6-9.