CN101431799B - Method for reducing resource allocation spending - Google Patents
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Abstract
The invention relates to a method of reducing resource distribution overhead, where system available resource is divided into plural basic units described in a manner of bottom nodes of a binary tree; after the base station distributes resource for the terminal, choosing a description way of smallest overhead according to the disposed plural resource description way and resource distributed currently, to create corresponding resource description way information and resource distribution information with the description way, writing said information into the resource distribution information to be transmitted to a terminal. The advantage of the invention includes that in a wireless communication system scheduled and controlled centralized by the base station, the base station chooses to create reasonable and effective resource distribution information to the terminal so as to reduce system resource distribution overhead and increase transmission system efficiency.
Description
Technical field
The present invention relates to wireless communication technology field, specifically, is the method that effectively reduces system resource overhead when the base station when terminal sends resource allocation message.
Background technology
In the wireless communication system, the base station is the equipment that service is provided to terminal, and the base station communicates by uplink downlink and terminal, and the direction of terminal is arrived in the descending base station that is meant, the up direction that is meant terminal to base station.A plurality of terminals can send data by up link to the base station simultaneously, also can receive data simultaneously from the base station by down link.
In the wireless communication system that adopts base station centralized scheduling control, the scheduling of all available resources of system distributes carries out the resource situation that can use when resource allocation conditions and terminal were carried out uplink when for example downlink transfer was carried out in the base station etc. by the base station.As can be seen, resource allocation message is a large amount of the existence, if do not adopt rational and effective message generation method to transmit these data, can waste valuable system descending resource, and then reduces the down transmission efficiency of system.It may be noted that all available resources of system singly refer to upstream or downstream among the present invention.
At present, have a kind of resource description mode that all available resources of system are divided into several elementary cells, these unit form the bottom node (fundamental node) of tree, and then constitute binary tree.An embodiment as shown in Figure 1, all available resources of this system are divided into 32 fundamental nodes, constitute 6 layers of binary tree, each node of describing like this on this binary tree needs 6 bits, if owing to reasons such as channel variation, discontinuous situation may appear in the resource of giving some terminal, for example give fundamental node four basic Li Jiedian 31 as shown in fig. 1 of certain terminal, 33,35 and 37, if the simple form of describing by node, need description node 31 respectively, 33,35 and 37, need 4 (bit number that the description node number is required)+4 * 6=28 bits.For example give fundamental node 15 fundamental nodes 31～45 as shown in fig. 1 of certain terminal again, if the simple form of describing by node, need description node 3,9,21 and 45, need 4 (bit number that the description node number is required)+4 * 6=28 bits, if it is very many that this situation occurs, can bring very big resource allocation overhead.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of method that reduces resource allocation overhead, and it is few that the resource allocation message of utilizing this method to make up takies resource, can reduce the expense of system resource allocation greatly.
In order to address the above problem, a kind of method that reduces resource allocation overhead provided by the invention may further comprise the steps:
(1) system's available resources are divided into a plurality of elementary cells, described elementary cell is described with binary tree bottom joint form;
(2) base station generates resource allocation message and sends to terminal according to the resource for terminal distribution, comprise node number and bit sequence in the described resource allocation message, the fundamental node that the corresponding described node number of each bit value in the described bit sequence comprises is used to illustrate the distribution state of this fundamental node.
Further, described node number is for comprising minimum one deck node number of all fundamental nodes that are assigned with.
Further, described terminal is resolved described resource allocation message, obtains the fundamental node that described node number comprises, and the distribution state according to the described fundamental node shown in the described bit sequence obtains Resources allocation information then.
In order to address the above problem, the another kind of method that reduces resource allocation overhead provided by the invention may further comprise the steps:
(1) system's available resources are divided into a plurality of elementary cells, described elementary cell is described with binary tree bottom joint form;
(2) base station generates resource allocation message and sends to terminal according to the resource for terminal distribution, comprise interstitial content and at least two node numbers in the described resource allocation message, one of them node number is a host node number, and its fundamental node that comprises has comprised the fundamental node that other node numbers comprised.
Further, described host node number is for comprising the minimum one-level node number of all fundamental nodes that are assigned with; Described other node numbers are the node number that comprises the fundamental node that is not assigned with in the fundamental node of described host node number.
Further, described terminal is resolved described resource allocation message, obtain the fundamental node that described host node number and other node numbers comprise, the fundamental node that described host node number is comprised is removed the fundamental node that described other node numbers comprise, obtain resource information into described terminal distribution.
In order to address the above problem, a kind of optimization that reduces the method for resource allocation overhead provided by the invention may further comprise the steps:
(1) system's available resources are divided into a plurality of elementary cells, described elementary cell is described with binary tree bottom joint form;
(2) after the base station is the terminal distribution resource, describing mode according to multiple resource description mode and a kind of expense minimum of resource selection of current distribution of configuration, generate corresponding resource description mode information and adopt the resource allocation information of this describing mode, and above-mentioned information is written to sends to terminal in the resource allocation message.
Further, the multiple resource description mode of described configuration comprises the combination of following resource description mode:
(a) describe resource allocation information by node number and bit sequence, the fundamental node that the corresponding described node number of each bit value in the described bit sequence comprises is used to illustrate the distribution state of this fundamental node;
(b) describe resource allocation information by interstitial content and at least two node numbers, one of them node number is a host node number, and its fundamental node that comprises has comprised the fundamental node that other node numbers comprised;
(c) describe resource allocation information by interstitial content and at least one node number, the fundamental node that described node number comprised is the fundamental node of distributing to described terminal, and includes the unallocated fundamental node of giving terminal in its even higher level of node number.
Further, described terminal is resolved the resource allocation message that adopts described resource description mode (c) to generate, and obtains the fundamental node that described node number comprises, and described fundamental node summation is the resource information of described terminal distribution.
The invention has the beneficial effects as follows, in the wireless communication system of base station centralized scheduling control, base station selected generation rationally efficiently resource allocation message give terminal, thereby reduced the system resource allocation expense, improved the efficiency of transmission of system.
Description of drawings
Fig. 1 is the structural representation of a kind of six layers of binary tree;
Fig. 2 is the method flow diagram of reduction resource allocation overhead of the present invention;
Fig. 3 is the schematic diagram of first kind of message embodiment of the method for reduction resource allocation overhead of the present invention;
Fig. 4 is the schematic diagram of second kind of message embodiment of the method for reduction resource allocation overhead of the present invention;
Fig. 5 is the schematic diagram of the third message embodiment of the method for reduction resource allocation overhead of the present invention.
Embodiment
Base station of the present invention to the thinking that terminal sends the method for resource allocation message is, system's available resources are divided into a plurality of fundamental nodes, and these fundamental nodes are described with binary tree; The resource description mode of base station selected optimum generates the shortest resource allocation message of length, and this resource allocation message comprises the field of an indication distribution method, also comprises the resource information that comprises a node number at least and distribute to terminal; The base station sends to terminal with this resource allocation message, and terminal is resolved this resource allocation message, thereby obtains to be the resource information of terminal distribution.
The invention will be further described below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
As shown in Figure 2, the method for reduction resource allocation overhead of the present invention may further comprise the steps:
Step 201: system's available resources are divided into a plurality of fundamental nodes, these fundamental nodes are described by binary tree;
Step 202: after the base station is the terminal distribution resource, from optional multiple resource description mode, select a kind of resource description mode of describing the used expense minimum of current resource allocation information, the resource allocation information that generates resource description mode indication information and represent by this resource description mode also writes resource allocation message, then this message is sent to terminal;
Step 203: terminal is resolved message after receiving resource allocation message, earlier determines currently used resource description mode according to resource description mode indication information wherein, parses wherein resource allocation information according to this resource description mode then.
In the above-mentioned steps 202, during base station selected resource description mode, calculate the length of the resource allocation message that each resource description mode of use generates, select the shortest resource description mode of resource allocation message length that generates.
Further specify below by some embodiment.
As shown in Figure 1, all available resources of base station are divided into 32 elementary cells, the corresponding fundamental node that is in the binary tree bottom of each elementary cell, thus form 6 layers of binary tree.
Embodiment one:
The present embodiment configuration is also selected a kind of resource description mode that is added bit sequence by a node number for use.This node number is the node number of lowest level node that comprises the fundamental node of all distribution, the bit number that this bit sequence comprises equals the fundamental segment that this node comprises counts, and whether the fundamental node of the value representation relevant position of each bit is assigned to terminal in this bit sequence.
For example, if the base station is want to distribute fundamental node 31,33,35,37 for terminal (MS), as can be seen from Figure 1, resource description mode according to present embodiment, the node number that has comprised the lowest level node of fundamental node 31,33,35,37 is 3, as adopting this resource description mode can generate as shown in Figure 3 resource allocation message, this message is made of following field: the field 301 of indexed resource describing mode, node number 302 and a bit sequence 303.Wherein, the value of the field of indexed resource describing mode is " 01 ", and expression resource description mode is the distribution method of node number+bit sequence; The value of node number is " 000011 ", and the expression node number is 3; The value of bit sequence is " 10101010 ", the length of bit sequence is 8 bits, each bit corresponding node number 3 fundamental nodes that comprised, 8 bits are just respectively to regard to fundamental node 31～38, wherein, represent that when bit value is 1 the fundamental node of this bit correspondence distributed to terminal, bit value is that the fundamental node of representing this bit correspondence at 0 o'clock is not distributed to terminal.
When terminal is described this resource allocation, need the 2+6+8=16 bit by said method, and if need 4+4 * 6=28 bit with binary tree node number describing mode merely, can save 12 bits.Suppose that the base station selected this resource distribution mode for use after relatively.(the resource description mode of pressing embodiment two needs 30 bits)
The base station sends to terminal with above-mentioned resource allocation message, and terminal is resolved this message.At first, terminal learns that according to the value " 01 " of the field 301 of indexed resource describing mode the resource description mode is the distribution method of node number+bit sequence, then according to node number 302 be worth know that the base station is that the fundamental node of its distribution is all or part of of the fundamental node that comprises of node 3, at last according to bit sequence 303 be worth know that the base station is that the fundamental node of its distribution is 31,33,35 and 37.
This embodiment also has a variation, and promptly resource description mode indication information can be represented in different ways, and embodiment one is the field that adopts the special indexed resource describing mode that is provided with in the message, takies 2 bits.And another kind of mode is directly to distinguish with message number, and when promptly resource allocation information adopted different resource description modes, described resource allocation message adopted different message number.Terminal can be learnt resource description mode used in this message according to this message number, thus correct the parsing.For embodiment two, three also herewith.
Embodiment two:
Present embodiment configuration and select for use a kind of by resource allocation information length information and a plurality of node number is formed and node between have the resource description mode of inclusion relation, but be different from existing mode.Earlier record comprises the node number (be also referred to as host node number) of lowest level node of the fundamental node of all distribution, record representative is in this lowest level node but the node number of all fundamental nodes that are not assigned with (has one or more then, can be the fundamental segment period, also can be the upper layer node that all is not assigned with of the fundamental node that comprises number).
For example, distribute fundamental node 31～45 if terminal MS is thought to be in the base station, as can be seen from Figure 1, the node number that has comprised the lowest level node of fundamental node 31～45 is 1, and node 46 is included in the node 1 but is not assigned with.As the resource description mode of pressing present embodiment, can generate resource allocation message as shown in Figure 4, this message is made of following field: the field 401 of indexed resource describing mode, interstitial content 402 (also can adopt alternate manners such as bit number to represent the length of resource allocation information), first segment period 403 and Section Point numbers 404.Wherein, the value of the field of indexed resource describing mode is " 10 ", and the resource description mode of present embodiment is adopted in expression, and inclusion relation is arranged between the node; Interstitial content is 0010, and expression has two nodes; The value of first segment period 403 is " 000001 ", representation node number 1, and the value of Section Point numbers 404 is " 101110 ", representation node numbers 46, the fundamental node that node number 1 comprises has comprised the fundamental node that node number 46 comprises.
When describing this resource allocation, terminal needs 2+4+2 * 6=18 bit by said method, if and need 4+4 * 6=28 bit with binary tree node number describing mode merely, promptly adopt the resource description mode of present embodiment can save 10 bits, perhaps, adopt the resource description mode of embodiment one also to need 24 bits, promptly adopt the resource description mode of present embodiment can save 8 bits.Suppose that the base station selected this resource distribution mode for use after relatively.
The base station sends to terminal with above-mentioned resource allocation message, and terminal is resolved this message.At first, terminal learns that according to the value " 10 " of the field 401 of indexed resource describing mode the resource description mode is the resource description mode of present embodiment; Being worth knowing and comprising two nodes in the resource allocation message according to message-length 402 then, again the back according to first segment period 403 be worth know that its fundamental node that comprises is 31～46, according to Section Point numbers 404 be worth know that its fundamental node that comprises is 46, the first segment period has comprised Section Point number, the fundamental node that comprises with the first segment period is removed the fundamental node that Section Point number comprises, and learns that the base station is that the resource of terminal distribution is a fundamental node 31～45.
Embodiment three:
Present embodiment has disposed the existing resources describing mode and has selected this mode for use in the base station.The resource allocation information of this mode also is made up of length information and a plurality of node number of resource allocation information, but does not have inclusion relation between node.
For example, if the base station is want to distribute fundamental node 31,42 for terminal MS, generate resource allocation message as shown in Figure 5, this message is made of following field: the field 501 of indexed resource describing mode, interstitial content 502, first segment period 503 and Section Point numbers 504.Wherein, the value of the field of indexed resource describing mode is " 11 ", and the resource description mode of present embodiment is adopted in expression; Interstitial content is 0010, and expression has two nodes; The value of first segment period 503 is " 011111 ", representation node numbers 31, and the value of Section Point numbers 504 is " 101010 ", representation node numbers 42 does not have inclusion relation between node number 31 and the node number 42.
When describing this resource allocation, terminal needs 2+4+2 * 6=18 bit by said method.And the resource description mode that adopts embodiment one needs 24 bits, adopts the resource description mode of embodiment two then to need more bits.Therefore the base station has been selected the resource description mode of present embodiment for use and has been generated resource allocation message.
The base station sends to terminal with above-mentioned resource allocation message, and terminal is resolved this message.At first, terminal learns that according to the value " 11 " of the field 501 of indexed resource describing mode the resource description mode is the resource description mode of present embodiment; Being worth knowing and comprising two nodes in the resource allocation message according to message-length 502 then, again the back according to first segment period 503 be worth know that its fundamental node that comprises is 31, according to Section Point numbers 504 be worth know that its fundamental node that comprises is 33, first segment period and Section Point number do not have inclusion relation, the fundamental node that the first segment period is comprised adds the fundamental node that Section Point number comprises, and learns that the base station is that the resource of terminal distribution is fundamental node 31 and 33.
In the above-described embodiments, the resource description mode among the embodiment one, two, three that has been the supposition base station configuration, optimum resource description mode is selected according to current resource allocation conditions in the base station.The process of selecting is, calculates the length of utilizing the resource allocation information that three kinds of modes generate respectively, selects the resource description mode of resource allocation information length minimum.
But need to prove, the resource description mode that the base station can dispose is not limited to disclosed by the invention several, any feasible resource description mode can adopt, and by judging selection, all can reach the technique effect that the present invention reduces resource allocation overhead.In addition, in other embodiments, the number of the resource description mode of base station configuration can be different, and as 2,3,4,5 or more, correspondingly resource description mode indication field can adopt 1, and 2,3 or more bits.
For example, except that the mode of embodiment one in three, can also dispose a kind of mode that only just can describe Resources allocation with a node, it is 31～46 o'clock for example for the resource of terminal distribution, only need joint to describe period 1 and get final product, the resource allocation message that generate this moment comprises the field and the node number of indexed resource describing mode.The value of resource description mode indication field wherein is 00.Terminal is promptly known all fundamental nodes that the follow-up resource of having only a node and distribution comprises for this node according to this value.
Except the mode of above several embodiment, for the present invention, also can only adopt disclosed resource description mode among embodiment one and the embodiment two.Constitute following examples:
Embodiment four
The present embodiment configuration is also selected a kind of resource description mode that is added bit sequence by a node number for use.This node number is the node number of lowest level node that comprises the fundamental node of all distribution, the bit number that this bit sequence comprises equals the fundamental segment that this node comprises counts, and whether the fundamental node of the value representation relevant position of each bit is assigned to terminal in this bit sequence.
For example, if the base station is want to distribute fundamental node 31,33,35,37 for terminal (MS), as can be seen from Figure 1, resource description mode according to present embodiment, the node number that has comprised the lowest level node of fundamental node 31,33,35,37 is 3, as the resource allocation message that adopts this resource description mode to generate is made of following field: node number and a bit sequence.Wherein, the value of node number is " 000011 ", and the expression node number is 3; The value of bit sequence is " 10101010 ", the length of bit sequence is 8 bits, each bit corresponding node number 3 fundamental nodes that comprised, 8 bits are just respectively to regard to fundamental node 31～38, wherein, bit value is that the fundamental node of representing this bit correspondence at 1 o'clock has been distributed to terminal, and bit value is that the fundamental node of representing this bit correspondence at 0 o'clock is not distributed to terminal.
When terminal is described this resource allocation, need the 6+8=14 bit by said method, and if need 4+4 * 6=28 bit with binary tree node number describing mode merely, can save 14 bits.
The base station sends to terminal with above-mentioned resource allocation message, and terminal is resolved this message.At first, the base station according to node number be worth know that the base station is that the fundamental node of its distribution is all or part of of the fundamental node that comprises of node 3, then according to bit sequence be worth know that the base station is that the fundamental node of its distribution is 31,33,35 and 37.
Embodiment five
Present embodiment configuration and select for use a kind of by resource allocation information length information and a plurality of node number is formed and node between have the resource description mode of inclusion relation.Earlier record comprises the node number of lowest level node of the fundamental node of all distribution, and record is included in this lowest level node but the node number of all fundamental nodes that are not assigned with (having one or more) then.
For example, distribute fundamental node 31～45 if terminal MS is thought to be in the base station, as can be seen from Figure 1, the node number that has comprised the lowest level node of fundamental node 31～45 is 1, and node 46 is included in the node 1 but is not assigned with.As the resource description mode of pressing present embodiment, the resource allocation message that can generate is made of following field: interstitial content (also can adopt alternate manners such as bit number to represent the length of resource allocation information), first segment period and Section Point number.Wherein, interstitial content is 0010, and expression has two nodes; The value of first segment period is " 000001 ", representation node number 1, and the value of Section Point number is " 101110 ", representation node numbers 46, the fundamental node that node number 1 comprises has comprised the fundamental node that node number 46 comprises.
When terminal is described this resource allocation, need 4+2 * 6=16 bit by said method, and if need 4+4 * 6=28 bit with binary tree node number describing mode merely, can save 12 bits.
The base station sends to terminal with above-mentioned resource allocation message, and terminal is resolved this message.At first, terminal is worth knowing and comprises two nodes in the resource allocation message according to message-length, again the back according to the first segment period be worth know that its fundamental node that comprises is 31～46, according to Section Point number be worth know that its fundamental node that comprises is 46, the first segment period has comprised Section Point number, the fundamental node that comprises with the first segment period is removed the fundamental node that Section Point number comprises, and learns that the base station is that the resource of terminal distribution is a fundamental node 31～45.
The above embodiment only is preferred embodiment of the present invention, and the present invention also can have other various embodiments.Under the situation that does not deviate from spirit of the present invention and essence thereof, those skilled in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong within the protection range of the appended claim of the present invention.
Claims (10)
1. a method that reduces resource allocation overhead is characterized in that, may further comprise the steps:
(1) system's available resources are divided into a plurality of elementary cells, described elementary cell is described with binary tree bottom joint form;
(2) base station generates resource allocation message and sends to terminal according to the resource for terminal distribution, comprise node number and bit sequence in the described resource allocation message, the fundamental node that the corresponding described node number of each bit value in the described bit sequence comprises is used to illustrate the distribution state of this fundamental node.
2. the method for claim 1 is characterized in that, described node number is for comprising minimum one deck node number of all fundamental nodes that are assigned with.
3. the method for claim 1, it is characterized in that, described terminal is resolved described resource allocation message, obtains the fundamental node that described node number comprises, and the distribution state according to the described fundamental node shown in the described bit sequence obtains Resources allocation information then.
4. a method that reduces resource allocation overhead is characterized in that, may further comprise the steps:
(1) system's available resources are divided into a plurality of elementary cells, described elementary cell is described with binary tree bottom joint form;
(2) base station generates resource allocation message and sends to terminal according to the resource for terminal distribution, comprise interstitial content and at least two node numbers in the described resource allocation message, one of them node number is a host node number, its fundamental node that comprises has comprised the fundamental node that other node numbers comprised, another node number is other node numbers, other node numbers are the node number of the fundamental node that is not assigned with in the fundamental node of the described host node of representative number, the fundamental node that described host node number is comprised is removed the fundamental node that described other node numbers comprise, obtain resource information into described terminal distribution.
5. method as claimed in claim 4 is characterized in that, described host node number is for comprising the minimum one-level node number of all fundamental nodes that are assigned with; Described other node numbers are the node number of the fundamental node that is not assigned with in the fundamental node of the described host node of representative number.
6. method as claimed in claim 4, it is characterized in that, described terminal is resolved described resource allocation message, obtain the fundamental node that described host node number and other node numbers comprise, the fundamental node that described host node number is comprised is removed the fundamental node that described other node numbers comprise, obtain resource information into described terminal distribution.
7. a method that reduces resource allocation overhead is characterized in that, may further comprise the steps:
(1) system's available resources are divided into a plurality of elementary cells, described elementary cell is described with binary tree bottom joint form;
(2) after the base station is the terminal distribution resource, according to the multiple resource description mode of configuration and the resource description mode of a kind of expense minimum of resource selection of current distribution, generate corresponding resource description mode information and adopt the resource allocation information of this describing mode, and above-mentioned information is written to sends to terminal in the resource allocation message;
The multiple resource description mode of described configuration comprises the combination of following resource description mode, and the different value of described resource description mode information is respectively applied for wherein a kind of resource description mode of indication:
First kind, by node number and bit sequence resource allocation information is described, described node number is for comprising minimum one deck node number of all fundamental nodes that are assigned with, the fundamental node that the corresponding described node number of each bit value in the described bit sequence comprises is used to illustrate the distribution state of this fundamental node;
Second kind, length information and at least two node numbers by resource allocation information are described resource allocation information, one of them node number is a host node number, described host node is the node number of lowest level node that comprises the fundamental node of all distribution, the representative of other node number is included in this host node but all fundamental nodes that are not assigned with, the fundamental node that described host node number is comprised is removed the fundamental node that described other node numbers comprise, obtain resource information into described terminal distribution;
The third, length information and at least one node number by resource allocation information are described resource allocation information, the fundamental node that described node number comprised is the fundamental node of distributing to described terminal, and includes the unallocated fundamental node of giving terminal in its even higher level of node number;
The 4th kind, by a node number resource allocation information is described, all fundamental nodes that the resource of described distribution comprises for this node.
8. method as claimed in claim 7, it is characterized in that, terminal is resolved message after receiving resource allocation message, earlier determines currently used resource description mode according to resource description mode indication information wherein, parses wherein resource allocation information according to this resource description mode then.
9. method as claimed in claim 7 is characterized in that, the length information of described resource allocation information is an interstitial content.
10. method as claimed in claim 7 is characterized in that,
When the currently used resource description mode of terminal judges is first kind as described, described resource allocation information is resolved, obtain the fundamental node that described node number comprises, the distribution state according to the described fundamental node shown in the described bit sequence obtains Resources allocation information then;
When the currently used resource description mode of terminal judges is second kind as described, described resource allocation information is resolved, obtain the fundamental node that described host node number and other node numbers comprise, the fundamental node that described host node number is comprised is removed the fundamental node that described other node numbers comprise, obtain resource information into described terminal distribution;
When the currently used resource description mode of terminal judges is the third as described, described resource allocation information is resolved, obtain the fundamental node that described node number comprises, described fundamental node summation is the resource information of described terminal distribution;
When the currently used resource description mode of terminal judges is the 4th kind as described, described resource allocation information is resolved, obtain described node number, whole fundamental nodes that this node number comprised are the resource of distributing to described terminal.
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