CN101553034B - Resource distributing method - Google Patents

Abstract

The invention discloses a method for resource allocation, which comprises the following steps: a base station divides a plurality of terminals with the same resource attribute or requirement into a group, and allocates time-frequency resources for the group; The resource allocation situation of each terminal is notified to each terminal. The invention can effectively reduce system overhead and improve system performance.

Description

resource allocation method

technical field

The present invention relates to the communication field, and more specifically relates to a resource allocation method.

Background technique

In an Orthogonal Frequency Division Multiplexing Code Division Multiple Access (OFDMA) wireless communication system, the base station refers to the equipment that provides services to the terminal. The base station communicates with the terminal through the uplink and downlink. The downlink refers to the direction from the base station to the terminal, and the uplink It refers to the direction from the terminal to the base station. Multiple terminals can simultaneously send data to the base station through the uplink, and can also receive data from the base station through the downlink at the same time.

In an OFDMA wireless communication system, transmission data resources are composed of time-domain symbols and frequency-domain subcarriers to form two-dimensional time-frequency domain resource blocks. Through the definition of frame, time-frequency domain resources are planned and scheduled in a unified manner. The frame structure can be divided into superframe, frame, subframe and symbol layer by layer.

Scheduling and allocation of all resources in an OFDMA system is usually performed by the base station, such as resource allocation when the base station performs downlink transmission and resource conditions that the terminal can use when performing uplink transmission. The control channel includes control and management messages for media access control (MAC) functions for the terminal, such as access, switching, power saving, etc.; on the other hand, the control channel also includes the mapping (MAP) that needs to indicate resource allocation for the terminal information.

In a general wireless communication system, the resource allocation management of each terminal is performed independently by the base station. As the number of terminals in the cell increases, the management and resource scheduling control messages of the base station also increase. This increases the management resources of the system and affects the system efficiency. Therefore, for those terminals with the same characteristics or requirements, grouping is used for unified management, which can achieve effective resource utilization and reduce system overhead.

Contents of the invention

In view of one or more problems mentioned above, the present invention provides a resource allocation method to effectively reduce system overhead and improve system performance.

The resource allocation method according to the embodiment of the present invention includes the following steps: the base station divides multiple terminals with the same attributes or requirements into a group, and allocates time-frequency resources for the group; and the base station uses the control channel (symbol mapping therein) to The resource allocation situation of each terminal in the group is notified to each terminal.

Wherein, the base station allocates time-frequency resources with fixed size and fixed position for the group. The base station sets the size of the control channel according to the resource requirements of the terminals in the group.

Wherein, the base station allocates a time-frequency resource whose size and/or location dynamically changes to the group according to the current service status and wireless channel environment. The base station sets the size of the control channel (symbol mapping therein) according to the number of terminals in the group and resource requirements. The base station notifies each terminal base station of the size and location information of the time-frequency resource allocated for the group through a header control message.

The invention can effectively reduce the overhead of system management messages and improve system performance.

Description of drawings

The accompanying drawings described here are used to provide a further understanding of the present invention and constitute a part of the application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention. In the attached picture:

FIG. 1 is a flowchart of a resource allocation method according to an embodiment of the present invention;

2 is a schematic diagram of an OFDMA frame structure according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a specific application of a downlink static group in a WiMAX OFDMA wireless communication system according to an embodiment of the present invention.

4 is a schematic diagram of a specific application of an uplink static group in a wireless communication system of WiMAXOFDMA technology according to an embodiment of the present invention;

5 is a schematic diagram of a specific application of a downlink dynamic group in a wireless communication system of WiMAXOFDMA technology according to an embodiment of the present invention; and

FIG. 6 is a schematic diagram of a specific application of an uplink dynamic group in a WiMAX OFDMA wireless communication system according to an embodiment of the present invention.

Detailed ways

The specific implementation manners of the present invention will be described in detail below with reference to the accompanying drawings.

Fig. 1 is a flowchart of a resource allocation method according to an embodiment of the present invention. As shown in Figure 1, the method includes the following steps: S102, the base station divides multiple terminals with the same attribute or resource requirements into a group, and allocates time-frequency resources for the group; and S104, the base station uses the control channel to The resource allocation status of each terminal in the group is notified to each terminal.

Wherein, the groups are divided into two types: one is a static group, and the other is a dynamic group.

For a static group, the size of the OFDMA resource block allocated by the base station for the group is fixed, and the resource area is also fixed. When the group is established, the size and resource area of the two-dimensional time-frequency domain resource blocks occupied by the static group in each OFDMA scheduling frame or subframe have been determined. During the operation of the group, unless there is a specific control message to change the size of the resource or the location of the resource area, no change will occur. The MAP message control channel in the static group is used to indicate the specific situation of user resource allocation in the group in each scheduling. Starting from the first basic resource block unit allocated to the group, the MAP message control channel is arranged in the order of the frequency domain first and then the time domain. The size of the MAP message control channel changes according to the number of users in the group and changes in demand.

For a dynamic group, the size of the OFDMA resources allocated by the base station for the group and the area in the time-frequency domain are not fixed dynamically. The establishment of a group only determines the identification (ID) of the group, and does not specifically divide resources for the group. During the operation of the group, the base station can dynamically assign resources to the group according to the current business conditions and wireless channel environment. The resource allocation area and size of the dynamic group are specified through the control header message in the frame structure (superframe or frame) of the upper layer. This superframe or the control message in the frame is used to indicate the frame structure (frame or subframe) of the next layer and the size, allocation and setting of the packet. Generally, it may be a Super-frame Header (Super-frame Header) message, a Frame Control Header (Frame Control Header, FCH for short) message, or a Scheduling-based Control Indication (SCI for short). The MAP message control channel in the dynamic group is used to indicate the specific situation of user resource allocation in the group in each scheduling. The size of the MAP message control channel changes according to the number of users in the group and changes in demand.

Based on the grouping mode, users in the group can be divided into static group users and dynamic group users.

For static group users, users already know the frame and subframe positions of the group in the system when they join the group. In the subsequent data transmission process using group resources, the user only needs to receive and demodulate the specific time-frequency domain position of the frame or subframe where the group is located. First read the MAP message of the static group control channel, and judge whether there is its own resource allocation message. If so, receive downlink data or send downlink data according to the instruction of the message. If not, the allocation of group resources can be ignored this time.

For dynamic group users, users get the ID of the group when they join the group, but cannot determine the frame and subframe position of the group in the system. The user receives and reads the indication of the control header message in the upper frame structure (superframe or frame), and obtains the specific resource allocation position and size of the group in the superframe or frame through the index. Then read the MAP message of the dynamic group control channel, and judge whether there is its own resource allocation message. If so, receive downlink data or send downlink data according to the instruction of the message. If not, the allocation of group resources can be ignored this time.

The present invention will be further described below with WiMAX OFDMA technology as the implementation background. As shown in Figure 2, WiMAX has a superframe with a unit of 20ms, a frame with a length of 5ms, a subframe with a size of 0.617ms, and a frame structure in which each subframe consists of 6 symbols. Each superframe has a superframe header, which occupies one or more symbols and is used for broadcast channel and control channel transmission of the superframe. Starting from the first basic resource block unit in the time-frequency domain of each downlink subframe, there is (but not necessarily) a subframe MAP control channel. The size of the subframe MAP control channel varies according to the number of MAP control messages.

As shown in Figure 3, the downlink grouping is taken as an example to describe a specific application of the static group in the wireless communication system of WiMAX OFDMA technology.

The process steps on the base station side are as follows:

The base stations are divided into different groups according to certain characteristic requirements. Taking the superframe as the period, each static group has already planned the occupied resource size and the position in the superframe when it is established.

The base station allocates resources to the group in units of subframes. The required resources of each group are planned into one or more fixed subframes in the superframe. The group resource areas in a superframe are not necessarily continuous, that is, there may be multiple subframe resource areas of a group in a superframe.

Each subframe resource area of a group has an intra-group resource allocation MAP, which is composed of the DL-MAP control channel of the subframe in the resource area, and the resource area of multiple subframe cascades is composed of the first subframe DL-MAP control channel . The resource allocation MAP is used to indicate the resource allocation of members in the group. The beginning of the resource allocation MAP has a subframe control channel header SCH, which is used to indicate the size of the MAP control channel, modulation and coding methods and other parameters. The base station instructs members in the group to allocate the resource area through the MAP control channel.

The base station informs the newly joined members of the group of the allocation position and size of the group in the super frame through the user DCD control message; the number and position of the group resource allocation MAP and other related parameters.

The steps on the end user side are as follows:

A user joins a static group. During the joining process, the base station informs the user of the location and size of the static group in the superframe, the number, location, and modulation and coding mode of the resource control MAP in the group through the user DCD control message.

According to the information obtained when joining the group, the user receives and reads the corresponding subframe MAP control channel information in each superframe. The user first reads the SCH of the subframe MAP, and determines the relevant parameters of the MAP control channel. Then read the subframe MAP control message according to these parameters.

The user checks in the subframe MAP control message whether there is a resource allocation IE belonging to it. If there is, read the data information of the corresponding resource block according to the IE instruction; if not, the data in this frame can be ignored.

As shown in FIG. 4 , taking uplink grouping as an example, a specific application of a static group in a wireless communication system using WiMAXOFDMA technology is described.

The process steps on the base station side are as follows:

Base stations are divided into different static groups according to certain characteristic requirements. Taking the superframe as the period, each static group has already planned the occupied resource size and the position in the superframe when it is established.

The base station allocates resources to the group in units of subframes. The required resources of each group are planned into one or more fixed subframes in the superframe. The group resource areas in a superframe are not necessarily continuous, that is, there may be multiple subframe resource areas of a group in a superframe.

Each subframe resource area of a group has an intra-group resource allocation MAP, which is composed of the UL-MAP control channel of the subframe corresponding to the resource area. The resource allocation MAP is used to indicate the resource allocation of members in the group. The beginning of the resource allocation MAP has a subframe control channel header SCH, which is used to indicate the size of the MAP control channel, modulation and coding methods and other parameters. The base station instructs members in the group to allocate the resource area through the MAP control channel.

The base station informs the newly joined members of the group of the allocation position and size of the group in the superframe through the user UCD control message; the number and position of the group resource allocation MAP and other related parameters.

The steps on the end user side are as follows:

A user joins a static group. During the joining process, the base station informs the user of the location and size of the static group in the superframe, the number, location, and modulation and coding mode of the resource control MAP in the group through the user UCD control message.

According to the information obtained when joining the group, the user receives and reads the corresponding subframe MAP control channel information in each superframe. The user first reads the SCH of the subframe MAP, and determines the relevant parameters of the MAP control channel. Then read the subframe MAP control message according to these parameters.

The user checks in the subframe MAP control message whether there is a resource allocation IE belonging to it. If there is, send data information in the corresponding resource block according to the IE instruction; if not, the data in this frame can be ignored.

As shown in Figure 5, the downlink grouping is taken as an example to describe a specific application of dynamic grouping in the wireless communication system of WiMAX OFDMA technology.

The process steps on the base station side are as follows:

Taking the superframe as the cycle, base stations are divided into different dynamic groups according to certain characteristic requirements. The base station only determines the ID and attributes of the dynamic group when establishing the dynamic group. In different superframe periods, the size and location of group resources are variable.

The base station allocates resources to the group in units of subframes. The base station dynamically allocates the required resources for each group with a superframe as a period, and then plans them into one or more subframes in the superframe. The group resource areas are not necessarily continuous, that is, there may be multiple subframe resource areas of one group in one superframe.

In the control channel of each superframe header, the base station indicates the resource area subframe position and size allocation of each dynamic group in the superframe, and also indicates the resource allocation MAP position in each dynamic group.

Each subframe resource area of a group has an intra-group resource allocation MAP, which is composed of the DL-MAP control channel of the subframe in the resource area, and the resource area of multiple subframe cascades is composed of the first subframe DL-MAP control channel . The resource allocation MAP is used to indicate the resource allocation of members in the group. The beginning of the resource allocation MAP has a subframe control channel header SCH, which is used to indicate the size of the MAP control channel, modulation and coding methods and other parameters. The base station instructs members in the group to allocate the resource area through the MAP control channel.

The base station broadcasts the control channel through the super frame header, and tells the members of the group the allocation position and size of the group in this super frame; the number and position of the group resource allocation MAP and other related parameters.

The steps on the end user side are as follows:

User joins a dynamic group. During the joining process, the base station informs the user of the dynamic group's ID, attributes and other information through the user's DCD control message.

According to the group ID information obtained when joining the group, the user receives and reads information such as the location and size of the subframe in the resource area of the dynamic group in the superframe, the location of the resource allocation MAP in the dynamic group, and other information at the head of each superframe.

According to the information obtained from the superframe header, the user searches for and reads the corresponding subframe MAP control channel information. The user first reads the SCH of the subframe MAP, and determines the relevant parameters of the MAP control channel. Then read the subframe MAP control message according to these parameters.

The user checks in the subframe MAP control message whether there is a resource allocation IE belonging to it. If there is, read the data information of the corresponding resource block according to the IE instruction; if not, the data in this frame can be ignored.

As shown in Figure 6, taking uplink grouping as an example, a specific application of dynamic grouping in the wireless communication system of WiMAX OFDMA technology is described.

The process steps on the base station side are as follows:

Taking the superframe as the cycle, base stations are divided into different dynamic groups according to certain characteristic requirements. The base station only determines the ID and attributes of the dynamic group when establishing the dynamic group. In different superframe periods, the size and location of group resources are variable.

The base station allocates resources to the group in units of subframes. The base station dynamically allocates the required resources for each group with a superframe as a period, and then plans them into one or more subframes in the superframe. The group resource areas are not necessarily continuous, that is, there may be multiple subframe resource areas of one group in one superframe.

In the control channel of each superframe header, the base station indicates the resource area subframe position and size allocation of each dynamic group in the superframe, and also indicates the resource allocation MAP position in each dynamic group.

Each subframe resource area of a group has an intra-group resource allocation MAP, which is composed of the UL-MAP control channel of the subframe corresponding to the resource area. The resource allocation MAP is used to indicate the resource allocation of members in the group. The beginning of the resource allocation MAP has a subframe control channel header SCH, which is used to indicate the size of the MAP control channel, modulation and coding methods and other parameters. The base station instructs members in the group to allocate the resource area through the MAP control channel.

The user checks in the subframe MAP control message whether there is a resource allocation IE belonging to it. If there is, read the data information of the corresponding resource block according to the IE instruction; if not, the data in this frame can be ignored.

The steps on the end user side are as follows:

User joins a dynamic group. During the joining process, the base station informs the user of the dynamic group's ID, attributes and other information through the user's DCD control message.

According to the group ID information obtained when joining the group, the user receives and reads information such as the location and size of the subframe in the resource area of the dynamic group in the superframe, the location of the resource allocation MAP in the dynamic group, and other information at the head of each superframe.

According to the information obtained from the superframe header, the user searches for and reads the corresponding subframe MAP control channel information. The user first reads the SCH of the subframe MAP, and determines the relevant parameters of the MAP control channel. Then read the subframe MAP control message according to these parameters.

The user checks in the subframe MAP control message whether there is a resource allocation IE belonging to it. If there is, send data information in the corresponding resource block according to the IE instruction; if not, the data in this frame can be ignored.

The above description is only an embodiment of the present invention, and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of the claims of the present invention.

Claims (2)

1. a resource allocation methods is characterized in that, may further comprise the steps:

The base station is divided into a group with attribute or the identical a plurality of terminals of demand, and is said set of dispense running time-frequency resource; And

Said base station is through control channel, and the resource allocation conditions at each the said terminal in said group is notified to each said terminal;

Wherein, said base station is that said set of dispense running time-frequency resource comprises:

Said base station is the running time-frequency resource of the fixing and fixed-site of said set of dispense size;

Perhaps, said base station is the running time-frequency resource of said set of dispense size dynamic change and/or position dynamic variation according to current state of affairs and wireless channel environment,

Said base station is provided with according to the number at the said terminal in said group and resource requirement size and the position to said control channel;

Be under the situation of running time-frequency resource of the fixing and fixed-site of said set of dispense size in said base station, said base station is provided with according to the resource requirement at terminal in said group size and the position to said control channel.

2. resource allocation methods according to claim 1 is characterized in that, it is the size and the positional information of the running time-frequency resource of said set of dispense that each said base station, said terminal is notified through a control messages in said base station.

Images