WO2012155488A1

WO2012155488A1 - Method and system for configuring control channel resources

Info

Publication number: WO2012155488A1
Application number: PCT/CN2011/083067
Authority: WO
Inventors: 鲁照华; 刘锟; 宁迪浩; 朱登魁
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-08-26
Filing date: 2011-11-28
Publication date: 2012-11-22
Also published as: CN102281247B; CN102281247A

Abstract

A method and system for configuring control channel resources is provided by the invention, and the method comprises the following steps: a base station carries a control channel resources starting position description field in a system information channel of a basic frame, and after said system information channel is received, a terminal determines the starting decoding position of the control channel according to said control channel resources starting position description field. Aiming at the control interference problem between adjacent cells, the scheme of the present invention promotes a new method for configuring control channel resources, which can suppress the control channel interference between adjacent cells, improve the utilization rate of the air interface resources, reduce the power consumption of the terminal and improve the service quality of the system.

Description

Control channel resource configuration method and system

Technical field

The present invention belongs to the field of communications, and in particular, to a control channel resource configuration method and system.

Background technique

In a communication system using Orthogonal Frequency Division Multiplexing (OFDM) technology, the basic parameters of the system are as shown in Table 1. One OFDM symbol includes 256 subcarriers in the frequency domain, where the data subcarriers 224, 6 phase tracking pilot subcarriers, 26 virtual subcarriers (protection subcarriers). Table 1 Basic parameters of OFDM

The basic frame (one time unit) structure of the above system is shown in Figure 1, mainly by the preamble sequence, A system information channel, a control channel, a transmission channel, and the like. The number of OFDM symbols occupied by the control channel is notified to the terminal (station) by the information carried in the system control channel transmitted by the base station (central access point) (as shown in Table 2, bit sequence b ₄₈ b ₄₉ ... b ₅₃ ), The starting position of the control channel resource is the first OFDM symbol following the OFDM symbol occupied by the system control channel. Table 2 System Information Field Definition

With the development of mobile Internet and the popularity of smart phones, the demand for mobile data traffic is growing rapidly, and the rapid growth of data services poses a severe challenge to the transmission capabilities of mobile communication networks. Data fly Rapid growth puts higher demands on air interface transmission capacity. In order to meet the requirements of air interface transmission capability, a new solution for the configuration of control channel resources is needed. SUMMARY OF THE INVENTION An object of the present invention is to provide a method and system for configuring a control channel resource to solve a problem of control channel interference of a neighboring cell. In order to solve the above technical problem, the present invention provides a control channel resource configuration method, including: a base station carrying a control channel resource start location description field in a system information channel of a basic frame, and the terminal receiving the system information channel according to the The Control Channel Resource Start Location Description field determines the starting decoding location of the control channel. The control channel resource start location description field indicates an initial OFDM symbol location of the control channel. The control channel resource start location description field is composed of 6 bits. The method further includes: after the decoding system information channel is completed, the terminal directly starts decoding the control channel from a starting OFDM symbol position indicated by the control channel resource start position description field. The value of the control channel resource start location description field carried by the neighboring base station of the base station in the system information channel of the basic frame and the control channel resource start location description field carried by the base station in the system information channel of the basic frame The values are different. The X OFDM symbols configured by the base station for the control channel are completely different or partially different from the Y OFDM symbols configured by the neighboring base stations of the base station for the control channel, where X and Y are natural numbers. In order to solve the above technical problem, the present invention further provides a control channel resource configuration system, including a base station and a terminal, where the base station includes a control channel resource configuration unit, the terminal includes a channel decoding unit, and the control channel resource configuration The unit is configured to carry a control channel resource start location description field in a system information channel of the basic frame; the channel decoding unit is configured to determine, according to the control channel resource start location description field, after receiving the system information channel channel The starting decoding position. In order to solve the above technical problem, the present invention further provides a method for configuring a control channel resource, including: a base station carrying a control channel resource start location description field in a system information channel of a basic frame, and using the control channel resource start location description The field indicates the number of subcarriers occupied by the control channel in the X OFDM symbols indicated by the control channel period indication field of the system information channel, where X is a natural number. The neighboring base stations of the base station do not use or use partial subcarriers occupied by the base station in the X OFDM symbols when transmitting the control channel. In order to solve the above technical problem, the present invention further provides a method for configuring a control channel resource, including: a base station carrying a control channel period indication field in a system information channel of a basic frame, where the control channel occupies X OFDM symbols, the base station The control channel is transmitted using H OFDM symbols in the X OFDM symbols, where X and H are natural numbers and H is less than X. The neighboring base station of the base station transmits a control channel using all or part of OFDM symbols except the H OFDM symbols among the X OFDM symbols. The H OFDM symbols are consecutive symbols.

This scheme proposes a new control channel resource allocation method for the adjacent cell control interference problem, which can suppress the control channel interference of neighboring cells, improve the utilization of air interface resources, reduce the power consumption of the terminal, and improve the service quality of the system. 1 is a frame structure of an OFDM system; FIG. 2 is a flowchart of an implementation of a control channel resource configuration method; FIG. 3 is a schematic diagram of a control channel resource configuration method in a second embodiment; FIG. 5 is a schematic diagram of a method for configuring a control channel resource in a fourth embodiment; FIG. 6 is a schematic diagram of a method for configuring a control channel resource in a fifth embodiment; FIG. 7 is a schematic diagram of a method for configuring a control channel resource in a sixth embodiment;

FIG. 8 is a schematic diagram of another method for configuring control channel resources in Embodiment 6.

A preferred embodiment of the present invention is as shown in FIG. 2. The control channel resource configuration method includes: the base station carries a control channel resource start location description field in a system information channel of a basic frame, and the terminal receives the system information channel according to the The Control Channel Resource Start Location Description field determines the starting decoding location of the control channel. The Control Channel Resource Start Location Description field indicates the starting OFDM symbol position information of the control channel.

Table 3 System Information Field Definitions

The Control Channel Resource Start Position Description field consists of 6 bits. After the decoding system information channel is completed, the terminal directly decodes the control channel from the OFDM symbol position indicated by the control channel resource start position description field. That is, the terminal does not need to decode the symbol between the OFDM symbol end of the system information channel resource OFDM symbol and the OFDM symbol of the control channel resource start position. The value of the control channel resource start location description field carried by the neighboring base station of the base station in the system information channel of the basic frame and the control channel resource start location description field carried by the base station in the system information channel of the basic frame The values are different. The X OFDM symbols configured by the base station for the control channel are completely different or partially different from the Y OFDM symbols configured by the neighboring base station for the control channel, where X and Y are natural numbers. The resource locations of the neighboring base stations transmitting the control channel are completely different or partially overlapping in the time domain, which can reduce the control channel interference of the neighboring base stations. In another implementation manner, the neighboring base station of the base station carries the value of the control channel resource start location description field in the system information channel of the basic frame and the base station carries the control channel resource in the system information channel of the basic frame. The values of the start location description field are the same, but the number of OFDM channels used by the two base stations is different, and the resource locations of the two base stations are partially overlapped in the time domain, and the control channel interference of the neighboring base stations can also be reduced.

Another control channel resource configuration method includes: the base station carries a control channel resource start location description field in a system information channel of a basic frame, and uses the control channel resource start location description field to indicate a control channel of a control channel in a system information channel. The number of subcarriers occupied by the X OFDM symbols indicated by the period indication field, and X is a natural number. The neighboring base stations of the base station do not use or use subcarriers in the X OFDM symbols used by the base station when transmitting the control channel. The resource locations of the neighboring base stations transmitting the control channels may be completely different or partially overlapping in the frequency domain to reduce the control channel interference of the neighboring base stations.

Another method for configuring a control channel resource includes: a base station carrying a control channel period indication field in a system information channel of a basic frame, indicating that a control channel occupies X OFDM symbols, and the base station uses H in the X OFDM symbols The OFDM symbols transmit control channels, where X and H are natural numbers and H is less than X. The neighboring base station of the base station transmits the control channel using all or part of the OFDM symbols except the H OFDM symbols in the X OFDM symbols. The resource locations of the neighboring base stations transmitting the control channel are completely different or partially overlapping, which can reduce the control channel interference of the neighboring base stations. The H OFDM symbols are consecutive symbols.

a control channel resource configuration system, including a base station and a terminal, the base station includes a control channel resource configuration unit, the terminal includes a channel decoding unit, and the control channel resource configuration unit is configured to perform a function of the base station side in the foregoing method, the channel The decoding unit is arranged to perform the function of the terminal side in the above method. I will not repeat them here. The details will be described below by way of specific examples. In a frame structure shown in FIG. 1, the base station BS-A carries a control channel resource start position description field (shown in Table 3) in a system information channel of a basic frame transmission, and the control channel The resource start location description field describes the starting OFDM symbol position information of the control channel. For example, the field describes that the control channel starts from the (T+S)th OFDM symbol in the frame, where T is the number of OFDM symbols occupied by the preamble sequence and the system information channel, that is, the control channel starts from The first OFDM after the OFDM symbol occupied by the system information channel is the Sth OFDM symbol of the starting point. After receiving the system information channel, the terminal determines a starting decoding position of the control channel according to the control channel resource start location description field. The terminal does not need to decode one or more OFDM symbols between the system information channel and the control channel, that is, the (T+1)th to the (T+S-1)th OFDM symbols in the basic frame, that is, the terminal decodes After the Tth OFDM symbol, decoding of the (T+S)th OFDM symbol begins.

In the frame structure shown in FIG. 1, the base station BS-A carries a control channel resource start position description field (shown in Table 3) in a system information channel of a basic frame transmission, and the control channel The resource start location description field describes the starting OFDM symbol position information of the control channel. For example, the field describes that the control channel starts from the (T+S)th OFDM symbol in the frame, where T is the number of OFDM symbols occupied by the preamble sequence and the system information channel, that is, the control channel starts from The first OFDM after the OFDM symbol occupied by the system information channel is the Sth OFDM symbol of the starting point. The base station BS-A transmits the control channel using the (T+S)th to the (T+Z)th OFDM symbols in the basic frame, where the value of Z is notified to the terminal by the control channel period indication field carried in the system information channel, or Z The value is the default value of the system. The neighboring base station BS-B of the base station BS-A transmits the control channel using the (T+M)th to the (T+N)th OFDM symbols in the basic frame, where M and N are both smaller than S, and M is smaller than N, as shown in the figure. 3 is shown. After receiving the system information channel, the terminal determines a starting decoding position of the control channel according to the control channel resource start location description field.

In the frame structure shown in FIG. 1, the base station BS-A carries a control channel resource start position description field (shown in Table 3) in a system information channel of a basic frame transmission, and the control channel The resource start location description field describes the starting OFDM symbol position information of the control channel. For example, the field describes that the control channel starts from the (T+S)th OFDM symbol in the frame, where T is the number of OFDM symbols occupied by the preamble sequence and the system information channel, that is, the control channel starts from The first OFDM after the OFDM symbol occupied by the system information channel is the Sth OFDM symbol of the starting point. The base station BS-A transmits the control channel using the (T+S)th to the (T+Z)th OFDM symbols in the basic frame, where the value of Z is notified to the terminal by the control channel period indication field carried in the system information channel, or Z The value is the default value of the system. The neighboring base station BS-B of the base station BS-A transmits the control channel using the (T+M)th to the (T+N)th OFDM symbols in the basic frame, where M and N are both greater than Z, and M is less than N, as shown in the figure. 4 is shown.

In the frame structure shown in FIG. 1, the base station BS-A carries a control channel resource start position description field (shown in Table 3) in a system information channel of a basic frame transmission, and the control channel The resource start location description field describes the starting OFDM symbol position information of the control channel. For example, the field describes that the control channel starts from the (T+S)th OFDM symbol in the frame, where T is the number of OFDM symbols occupied by the preamble sequence and the system information channel, that is, the control channel starts from The first OFDM after the OFDM symbol occupied by the system information channel is the Sth OFDM symbol of the starting point. The base station BS-A transmits the control channel using the (T+S)th to the (T+Z)th OFDM symbols in the basic frame, where the value of Z is notified to the terminal by the control channel period indication field carried in the system information channel, or Z The value is the default value of the system. The neighboring base station BS-B of the base station BS-A transmits the control channel using the (T+M)th to the (T+N)th OFDM symbols in the basic frame, where M is smaller than S and N is greater than S, as shown in FIG. .

In the frame structure shown in FIG. 1, the base station BS-A carries a control channel resource start position description field (shown in Table 3) in a system information channel transmitted by a basic frame, and the control channel The resource start location description field describes the number of subcarriers occupied by the control channel in one or more OFDM symbols (eg, X) indicated by the control channel period indication field carried in the system information channel. For example, this field describes that the control channel occupies P subcarriers in the X OFDM symbols indicated by the Control Channel Period Indicator field (as shown in Figure 6). After receiving the system information channel, the terminal determines a starting decoding position of the control channel according to the control channel resource start location description field. The terminal does not need to decode information carried on subcarriers other than P subcarriers in the X OFDM symbols.

In the frame structure shown in FIG. 1, the base station BS-A carries a control channel resource start position description field (shown in Table 3) in a system information channel of a basic frame transmission, and the control channel The resource start location description field describes the number of subcarriers occupied by the control channel in one or more OFDM symbols (eg, X) indicated by the control channel period indication field carried in the system information channel. For example, the field describes that the control channel occupies P subcarriers in the X OFDM symbols indicated by the Control Channel Period Indicator field. The neighboring base station BS-B of the base station BS-A cannot use or partially use P subcarriers of the X OFDM symbols when transmitting the control channel in the frame, as shown in FIG. 7 or FIG. 8. Preferably, in the specific embodiments 1 to 6, the control channel resource start position description field is composed of 6 bits. The base stations BS-A, BS-B use the same carrier frequency.

It should be noted that FIG. 1 shows a schematic diagram of a frame structure, and the frame structure with the modification is suitable for the present invention, and details are not described herein again.

It should be noted that the features in the embodiments and the embodiments of the present application may be arbitrarily combined with each other without conflict. It is a matter of course that the invention may be embodied in various other forms and modifications without departing from the spirit and scope of the invention. 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.

Industrial Applicability Compared with the prior art, the present invention can suppress control channel interference of adjacent cells, improve utilization of air interface resources, reduce power consumption of terminals, and improve service quality of the system.

Claims

Claim

A method for configuring a control channel resource, comprising:

The base station carries a control channel resource start location description field in the system information channel of the basic frame, and after receiving the system information channel, the terminal determines a starting decoding location of the control channel according to the control channel resource start location description field.

2. The method of claim 1, wherein the control channel resource start location description field indicates a starting orthogonal frequency division multiplexing OFDM symbol location of the control channel.

3. The method according to claim 1, wherein the control channel resource start position description field is composed of 6 bits.

4. The method according to claim 2, further comprising: after the decoding system information channel is completed, directly decoding the control channel from a starting OFDM symbol position indicated by the control channel resource start position description field. .

The method according to claim 1, wherein the value of the control channel resource start location description field carried by the neighboring base station of the base station in the system information channel of the basic frame and the system information of the base station in the basic frame are The value of the control channel resource start location description field carried in the channel is different.

The method of claim 1, wherein the X OFDM symbols configured by the base station for the control channel are completely different or partially different from the Y OFDM symbols configured by the neighboring base stations of the base station for the control channel, where X and Y are natural numbers.

A control channel resource configuration system, comprising: a base station and a terminal, wherein the base station includes a control channel resource configuration unit, the terminal includes a channel decoding unit; and the control channel resource configuration unit is configured to be in a basic frame system The information channel carries a control channel resource start location description field; The channel decoding unit is configured to determine a starting decoding position of the control channel according to the control channel resource start location description field after receiving the system information channel.

8. A method for configuring a control channel resource, comprising:

The base station carries a control channel resource start location description field in the system information channel of the basic frame, and uses the control channel resource start location description field to indicate the X orthogonal frequency indicated by the control channel in the control channel period indication field of the system information channel. The number of subcarriers occupied in the multiplexed OFDM symbol, where X is a natural number.

The method according to claim 8, wherein the neighboring base station of the base station does not use or use a part of the subcarriers occupied by the base station in the X OFDM symbols when transmitting the control channel.

10. A method for configuring a control channel resource, including:

The base station carries a control channel period indication field in the system information channel of the basic frame to indicate that the control channel occupies X orthogonal frequency division multiplexing OFDM symbols, and the base station uses the H OFDM symbol transmission control in the X OFDM symbols Channel, where X and H are natural numbers and H is less than X.

The method according to claim 10, wherein the neighboring base station of the base station transmits a control channel using all or part of OFDM symbols except the H OFDM symbols in the X OFDM symbols.

12. The method of claim 10, wherein

The H OFDM symbols are consecutive symbols.