CN101176277B

CN101176277B - Method and apparatus for indexing physical channels in an ofdma system

Info

Publication number: CN101176277B
Application number: CN2006800164397A
Authority: CN
Inventors: 权桓准; 金东熙; 韩臸奎; 李周镐; 赵俊暎; 金唯哲
Original assignee: Samsung Electronics Co Ltd
Current assignee: Samsung Electronics Co Ltd
Priority date: 2005-05-13
Filing date: 2006-05-12
Publication date: 2012-11-14
Anticipated expiration: 2026-05-12
Also published as: TWI311412B; KR20060117864A; CN101176277A; KR100933157B1; TW200701679A

Abstract

A method and system for indexing physical channels in an OFDMA system where one OFDM symbol includes a plurality of subcarriers and one TTI includes a plurality of OFDM symbols, are provided. A total number of subcarriers per OFDM symbol are divided into N groups. A k<SUP>th </SUP>group is selected from the N groups in each OFDM symbol of a TTI, and a physical channel corresponding to a set of subcarriers indexed with predetermined values, included in the k<SUP>th </SUP>groups of the TTI is indexed with an ordered pair (N, k).

Description

The method and apparatus of index physical channel in orthogonal frequency division multiple access system

Technical field

The present invention relates generally to OFDM (OFDM) wireless communication system.More specifically, the present invention relates to a kind of method and apparatus that is used at OFDM wireless communication system index (index) physical channel.

Background technology

Carry out active research to OFDM being used for wireless communication system.OFDM is a kind of multi-carrier modulation (MCM) of specific type, and wherein the serial code element sequence of input is transformed to parallel sequence before transmission, and is modulated to mutually orthogonal a plurality of subcarriers.

OFDM more is commonly used in the digital transmission technology.The example that OFDM is used in digital transmission technology comprises digital audio broadcasting (DAB), DTV and wireless lan (wlan).Because the robustness of OFDM anti-multipath decline, OFDM is that high speed data transfer provides efficient platform.

Based on the main multiple access system of OFDM be OFDM insert (OrthogonalFrequency Division Multiple Access, OFDMA).In OFDMA, frequency domain is divided into the subchannel that has a plurality of subcarriers separately, and time domain is divided into a plurality of time slots (time slot), and subchannel is assigned to different users.The OFDMA of Resources allocation can hold numerous user when only using limited resources in time-frequency domain.

Fig. 1 shows the example of the time-frequency resources (time-frequency resource) in traditional OFDM wireless communication system.

With reference to Fig. 1, the trunnion axis express time, and vertical axis is represented frequency.Because ofdm system typically sends a modulated symbol (QPSK (QuadraturePhase Shift Keying on a subcarrier 101; Or 16 yuan of quadrature amplitude modulation (16-ary QuadratureAmplitude Modulation QPSK)); 16 QAM), this subcarrier is a basic resources.A rectangle of a subcarrier of expression is a time-frequency resources in specific OFDM code element.

Generally speaking, each OFDM code element 102 comprises a plurality of subcarriers.As shown in Figure 1, do not protecting (guard) when subcarrier does not exist, all subcarriers all are the data subcarriers that is used to transmit data.(Transmission Time Interval, TTI) 103 basic grouped transmission unit is made up of one group of OFDM code element to be called as Transmission Time Interval.

In Fig. 1, each little rectangle is called as T/F lattice (bin), and TTI is made up of a plurality of T/F lattice.Physical channel is to be used in channel in the typical GSM, the carrying different types of information as PCH, Packet Data Channel (PDCH), packet data control channel (PDCCH) and uplink scheduled channel.

Typically, a TTI 103 comprises a plurality of physical channels.For example, some T/F lattice are used to PCH, and other are used to during TTI 103, provide the CCCH (CCCH) of system information.In addition, some T/F lattice are assigned to PDCH, and other are assigned to PDCCH, and this PDCCH is used for during TTI 103, providing demodulation PDCH needed control information.Though do not specify here, other physical channel can be defined according to its purpose.

Physical channel needs different time-frequency resource.For example; Suppose 5; 000 T/F lattice (for example is used for a TTI; 10 OFDM code elements are used for a TTI, and each OFDM code element comprises 500 data subcarriers), then can to resource distribute so that: PCH has 100 subcarriers, CCCH and uses 500 subcarriers, 4000 subcarriers to be used to transmit user data and 400 subcarriers are used to send PDCCH.

In the superincumbent typical OFDM wireless communication system, can tie up the ground resource allocations with time and frequency 2, and a plurality of physical channel needs the resource of varying number.Therefore, must specify effectively of the distribution of T/F lattice to physical channel, and, also must be between transmitter and receiver the distribution of delivery time-frequency grid.If in a TTI, there are 5,000 subcarriers, then transmitter must can be notified receiver: subcarrier #1 to #100 is used for PCH, and subcarrier #101 to #600 is assigned to common signal channel.For this purpose, can use OFDM symbol index and subcarrier index to identify (identify) each physical channel.But, because the too many information of these method needs is used for identifying the subcarrier of each physical channel, so this method efficient is low.

Particularly, when multiplexing a plurality of PDCH in TTI, by each PDCH of channel indexes sign.Corresponding with each channel indexes, between transmitter and receiver, preset OFDM code element and subcarrier that (preset) is assigned to the channel of channel indexes.

Fig. 2 shows the example of a plurality of physical channels of index in traditional OFDM wireless communication system.

With reference to Fig. 2, the trunnion axis express time, and vertical axis is represented frequency.Each OFDM code element 202 comprises a plurality of subcarriers, and each TTI 203 is made up of a plurality of physical channels.Each physical channel be equal to the T/F diversity channel (Time-Frequency Diversity Channel, TFDCH) 204,205 or 206, this be because, be configured a plurality of subcarriers that in time and frequency, scatter at 203, one TFDCH of TTI.As shown in Figure 2, give each TFDCH with predetermined method with sub-carrier allocation at specific T TI, and between transmitter and receiver, define information about the resource that is used for this TFDCH by the respective channel index.

Above conventional art effectively indicated at all physical channels and had the subcarrier that (that is, the subcarrier of equal number is assigned to each physical channel during TTI) under the situation of equal length is used for each physical channel.But when physical channel had different channels length, it was used in index or indication having limitation on the resource of each physical channel.

Therefore, have the situation of different channels length, need be used for improving one's methods and equipment at OFDM wireless communication system index physical channel for physical channel.

Summary of the invention

Example embodiment of the present invention solves at least (address) the problems referred to above and/or shortcoming, and advantage described below is provided at least.Therefore, aspect of the present invention provides a kind of method and apparatus that is used for when the multiplexing physical channel with different channels length of OFDM wireless communication system, representing effectively being used for the time-frequency resources of each physical channel.

Example embodiment of the present invention provides a kind of method and apparatus that is used for effectively defining for 2 dimension time-frequency resources at the OFDM wireless communication system resource allocation unit.

Example embodiment of the present invention provides a kind of being used for to tie up the method and apparatus that time-frequency resources effectively distribute at the OFDM wireless communication system to 2.

An aspect according to example embodiment of the present invention; Comprise in the method for index physical channel in the OFDMA system that a plurality of subcarriers and TTI comprise a plurality of OFDM code elements an OFDM code element, the subcarrier of the entire quantity of each OFDM code element is divided into N group.Select the k group in from each OFDM code element of TTI N the group, and utilize ordered pair (N, k) to the k group that is included in this TTI in, one group of corresponding physical channel of subcarrier carrying out index by predetermined value carries out index.

Be used for comprising a plurality of subcarriers and TTI comprises in the OFDMA system index physical channel and the transmitter with the emission of the physical channel behind the index of a plurality of OFDM code elements an OFDM code element; Mission controller is divided into N group with the subcarrier of the entire quantity of each OFDM code element; Select the k group in N the group from each OFDM code element of TTI; Utilize ordered pair (N; K) to the k group that is included in this TTI in, one group of corresponding physical channel of subcarrier carrying out index by predetermined value carries out index, and the physical channel behind the control index is multiplexing.The physical channel index makes up the index information of physical channel under the control of mission controller, and the OFDM transmitter through the index information and the Traffic Channel of multiplexing physical channel, makes up the frame to receiver to be launched under the control of mission controller.

In the physical channel and receiver that are used for after an OFDM code element comprises the OFDMA system reception hint that a plurality of subcarriers and TTI comprise a plurality of OFDM code elements about the information of the index of this physical channel; The OFDM receiver is the index information and the Traffic Channel of physical channel from the transmitter received frame and with received frame demultiplexing under the control that receives controller.Physical channel index analyzer is analyzed the index information of received physical channel under the control of said reception controller.Receive controller, be used to control the physical channel of demultiplexing from TTI.Each physical channel through following process by index: the subcarrier of entire quantity in each OFDM code element is divided into N group; Select the k group in N the group from each OFDM code element of this TTI; And utilize ordered pair (N, k) to the k group that is included in this TTI in, one group of corresponding physical channel of subcarrier carrying out index by predetermined value carries out index.

Comprise in the system of the physical channel after transmitting and receiving index in the OFDMA system that a plurality of subcarriers and TTI comprise a plurality of OFDM code elements an OFDM code element; The base station comprises transmitter; This transmitter is used for: the subcarrier of each OFDM code element entire quantity is divided into N group; Select the k group in N the group from each OFDM code element of this TTI; Utilize ordered pair (N, k) to the k group that is included in this TTI in, one group of corresponding physical channel of subcarrier carrying out index by predetermined value carries out index, and the physical message behind the emission index.The terminal comprises receiver, and this receiver is used for receiving from the transmitter of base station and utilizes that (N k) carries out the physical channel of index.

Another aspect according to example embodiment of the present invention; Comprise in the method for index physical channel in the OFDMA system that a plurality of subcarriers and TTI comprise a plurality of OFDM code elements an OFDM code element, the subcarrier of the entire quantity of each OFDM code element is divided into N group.Select the k group in from each OFDM code element of TTI N the group, and utilize ordered pair (N, k) to the k group that is included in this TTI in, one group of corresponding physical channel of subcarrier carrying out index by predetermined value carries out index.With ordered pair (N, k) corresponding time-frequency resources is represented by the peculiar sequence S in the base station with L element, wherein L is included in the quantity of the OFDM code element among the TTI, and S={S1 ..., SL}.

Be used for comprising a plurality of subcarriers and TTI comprises in the OFDMA system index physical channel and the transmitter with the emission of the physical channel behind the index of a plurality of OFDM code elements an OFDM code element, mission controller is divided into N group with the subcarrier of the entire quantity of each OFDM code element.Select the k group in N the group of mission controller from each OFDM code element of TTI then; Utilize ordered pair (N; K) to the k group that is included in this TTI in, one group of corresponding physical channel of subcarrier carrying out index by predetermined value carries out index, and the physical channel behind the control index is multiplexing.With ordered pair (N, k) corresponding time-frequency resources is represented by the peculiar sequence S in the base station with L element, wherein L is included in the quantity of the OFDM code element among the TTI, and S={S1 ..., SL}.The physical channel index makes up the index information about physical channel under the control of mission controller, and the OFDM transmitter through the index information and the Traffic Channel of multiplexing physical channel, makes up the frame to receiver to be launched under the control of mission controller.

In the physical channel and receiver that are used for after an OFDM code element comprises the OFDMA system reception hint that a plurality of subcarriers and TTI comprise a plurality of OFDM code elements about the information of the index of this physical channel; The OFDM receiver is the index information and the Traffic Channel of physical channel from the transmitter received frame and with received frame demultiplexing under the control that receives controller.Physical channel index analyzer is analyzed the index information of received physical channel under the control of said reception controller.Receive controller, be used to control the physical channel of demultiplexing from TTI.Each physical channel through following process by index: the subcarrier of the entire quantity of each OFDM code element is divided into N group; Select the k group in N the group from each OFDM code element of this TTI; And utilize ordered pair (N, k) to the k group that is included in this TTI in, one group of corresponding physical channel of subcarrier carrying out index by predetermined value carries out index.Here, with ordered pair (N, k) corresponding time-frequency resources is represented by the peculiar sequence S in the base station with L element, wherein L is included in the quantity of the OFDM code element among the TTI, and S={S1 ..., SL}.

Comprise in the system of the physical channel after transmitting and receiving index in the OFDMA system that a plurality of subcarriers and TTI comprise a plurality of OFDM code elements an OFDM code element, the base station comprises transmitter, and the terminal comprises receiver.Transmitter is divided into N group with the subcarrier of the entire quantity of each OFDM code element.Select the k group in N the group of transmitter from each OFDM code element of this TTI then; Utilize ordered pair (N; K) to the k group that is included in this TTI in, one group of corresponding physical channel of subcarrier carrying out index by predetermined value carries out index, and the physical message behind the index of control TTI is multiplexing.Here, with ordered pair (N, k) corresponding time-frequency resources is represented by the peculiar sequence S in the base station with L element, wherein L is included in the quantity of the OFDM code element among the TTI, and S={S1 ..., SL}.Receiver receives from the transmitter of base station and utilizes that (N k) carries out the physical channel of index.

Another aspect according to example embodiment of the present invention; Comprise in the method for index physical channel in the OFDMA system that a plurality of subcarriers and TTI comprise a plurality of OFDM code elements an OFDM code element; The time-frequency resources of TTI is divided into N equidistance and local (localized) group; And (N k) organizes corresponding physical channel to the k in organizing with this N and carries out index to utilize ordered pair.With this k group further be divided into m equidistance group in time and utilize orderly tlv triple (triple) (N, k, m) to division after the corresponding physical channel of group carry out index.

Be used for comprising the OFDM that a plurality of subcarriers and a Transmission Time Interval (TTI) comprise a plurality of OFDM code elements and insert in (OFDMA) system index physical channel and the transmitter a kind of the emission of the physical channel behind the index in an OFDM (OFDM) code element; Mission controller is divided into N equidistance and local group with the time-frequency resources of TTI; Utilize ordered pair (N; K) k in organizing with this N is organized corresponding physical channel and carry out index; This k group is divided into m equidistance group in time, utilizes orderly tlv triple (N, k; M) to divide after the corresponding physical channel of group carry out index, and the physical channel behind the control index is multiplexing.The physical channel index makes up the index information of said physical channel under the control of mission controller.The OFDM transmitter through the index information and the Traffic Channel of multiplexing physical channel, makes up the frame to receiver to be launched under the control of mission controller.

In a kind of physical channel and receiver that is used for after an OFDM (OFDM) code element comprises OFDM that a plurality of subcarriers and a Transmission Time Interval (TTI) comprise a plurality of OFDM code elements to insert (OFDMA) system reception hint about the information of the index of this physical channel; The OFDM receiver is the index information and the Traffic Channel of physical channel from the transmitter received frame and with received frame demultiplexing under the control that receives controller.Physical channel index analyzer is analyzed the index information of received physical channel under the control that receives controller.Receive the demultiplexing of controller control from the physical channel of TTI.Each physical channel through following process by index: the time-frequency resources of TTI is divided into N equidistance and local group; Utilize ordered pair (N; K) k in organizing with this N is organized corresponding physical channel and carry out index, this k group is divided into m equidistance group in time, and utilizes orderly tlv triple (N; K, m) to divide after the corresponding physical channel of group carry out index.

Comprising the OFDM that a plurality of subcarriers and a Transmission Time Interval (TTI) comprise a plurality of OFDM code elements in an OFDM (OFDM) code element inserts in the system of the physical channel after transmitting and receiving index in (OFDMA) system; The base station comprises transmitter, and the terminal comprises receiver.Transmitter is divided into N equidistance and local group with the time-frequency resources of TTI; (N k) organizes corresponding physical channel to the k in organizing with this N and carries out index, and this k group is divided into m equidistance group in time to utilize ordered pair; Utilize orderly tlv triple (N; K, m) to divide after the corresponding physical channel of group carry out index, and the physical channel behind the emission index.Receiver receives from the transmitter of said base station and utilizes that (N k) carries out the physical channel of index.

To one skilled in the art, other purpose of the present invention, advantage and notable feature will be from carrying out becoming the disclosed detailed description obvious below in conjunction with accompanying drawing to example embodiment of the present invention.

Description of drawings

Above-mentioned and other purpose, the feature and advantage of specific embodiment of the present invention will become clearer from the description below in conjunction with accompanying drawing, in the accompanying drawing:

Fig. 1 shows the example of the time-frequency resources in traditional OFDM wireless communication system;

Fig. 2 shows the example of the index of a plurality of physical channels in traditional OFDM wireless communication system;

Fig. 3 show according to first example embodiment of the present invention, to the index of a plurality of physical channels;

Fig. 4 show according to first example embodiment of the present invention, with the index of tree structure to a plurality of physical channels;

Fig. 5 show according to first example embodiment of the present invention, represent in the classification of the tree structure shown in Fig. 4;

Fig. 6 show according to first example embodiment of the present invention, with the corresponding TFDCH of a plurality of physical channels of the different length that in a TTI, is re-used;

Fig. 7 show according to second example embodiment of the present invention, (N is k) to the index of physical channel with DRCH;

Fig. 8 show according to second example embodiment of the present invention, at S={0,1,2,3,4,5,6, during 7} to the resource allocation of DRCH (8,0) and DRCH (8,4);

Fig. 9 show according to second example embodiment of the present invention, represent in the classification of the tree structure shown in Fig. 8;

Figure 10 show according to second example embodiment of the present invention, with the corresponding DRCH of a plurality of physical channels of the different length that in a TTI, is re-used;

Figure 11 show according to the 3rd example embodiment of the present invention, (N is k) to the index of physical channel with LRCH;

Figure 12 show according to the 3rd example embodiment of the present invention, represent in the classification of the tree structure shown in Figure 11; With

Figure 13 is according to example embodiment of the present invention, at the block diagram of the transmitter and receiver of the ofdm system that is used for the index physical channel.

Run through accompanying drawing, identical referenced drawings label will be understood that to refer to identical element, characteristic and structure.

Embodiment

Definedly in description to provide in order helping to understand embodiments of the invention more all sidedly, and only to be exemplary such as detailed structure and the such content of element.Therefore, those of ordinary skill in the art will be appreciated that, under the condition that does not depart from the scope of the present invention with spirit, can carry out various variations and the change of described embodiment here.And, for clear and simple and clear, the description of having omitted known function and structure.

The invention is intended to provide a kind of TFDCH indexing means; In the method; All use " N k group in group " that form by the time-frequency resources in TTI (a plurality of subcarrier) to define with corresponding each TFDCH of physical channel; And (N k) identifies said physical channel by ordered pair (ordered pair).

In the time of during the physical channel of different channels length is present in identical TTI, with tree structure configuration be used to identify physical channel ordered pair (N, k) so that identify employed time-frequency resources more effectively.

Will be to being described in detail according to the expression of " N k group in group " example embodiment of the present invention, the physical channel indexing means characteristic and with the index of tree structure to physical channel.

For example, suppose that a TTI comprises 10 OFDM code elements that have 500 subcarriers separately, then 5,000 time-frequency resources are present in during the TTI.(N k) representes that with tree structure physical channel is following by ordered pair.

" with ordered pair (N, k) expression physical channel " sentence shows that all time-frequency resources are organized as N group, and physical channel to be this N the k in organizing organize.This physical channel indexing means is summed up as follows:

(1) when all time-frequency resources were assigned to a physical channel, the quantity of available physical channel was ' 1 ', and thus this physical channel was defined as TFDCH (1,0).

(2) when all time-frequency resources were assigned to two physical channels, the quantity of available physical channel was ' 2 ', and thus these two physical channels was defined as TFDCH (2,0) and TFDCH (2,1).

(3) when all time-frequency resources were assigned to three physical channels, the quantity of available physical channel was ' 3 ', and thus this physical channel was defined as TFDCH (3,0), TFDCH (3,1) and TFDCH (3,2).

(4) through deducting, can with the particular example algebraically of above-mentioned physical channel index reduce with the physical channel index be TFDCH (N, k).

The multiple method of utilizing time-frequency resources to define N physical channel is arranged, can be expressed as on the mathematics

TFDCH (N, k)=have the sub carrier groups of index n,

n％N＝(k+L+B)％?N?. . . . . (1)

Wherein, % represents modular arithmetic, the OFDM symbol index of L representative in TTI, and B represents base station (BS) index, the quantity of the physical channel that the N representative is to be disposed, k (=0 ..., N-1) represent the TFDCH index, and the subcarrier index of n representative in the OFDM code element.Therefore, (N k) is the set with subcarrier of the index n that satisfies equation (1) to TFDCH.For better understanding, describe in the face of Fig. 3 down equation (1).

Fig. 3 shows the index to a plurality of physical channels according to first example embodiment of the present invention.

With reference to Fig. 3, the trunnion axis express time, and vertical axis is represented frequency.A TTI 303 is made up of 8 OFDM code elements 302 that have 32 subcarriers separately.For N=4, B=0 and k=0, reference number 301 is represented the subcarrier of TFDCH (4,0).

From 8 OFDM code elements of L=0 to L=7 index, and from 32 subcarriers of n=0 to n=31 index each OFDM code element.Satisfy the subcarrier of the TFDCH (4,0) of equation (1) and used the line markings that has a down dip from upper right left.Equation (1) is of a plurality of mathematical definitions of being used for through modular arithmetic the TFDCH of predetermined length easily being disposed.Except that the equation (1), the TFDCH that many other mathematical formulaes can be used for disposing different length is to satisfy various objectives.At present will be with reference to Fig. 4, to describing with the above-mentioned different TFDCH of tree structure index.

Fig. 4 diagram index that first example embodiment is carried out a plurality of physical channels with tree structure according to the present invention.

With reference to Fig. 4, a TTI 403 comprises 8 OFDM code elements that have 32 subcarriers separately.For N=8, B=0 and k=0 and 4, reference number 401 is represented the subcarrier of TFDCH (8,0) and reference number 404 is represented the subcarrier of TFDCH (8,4).The subcarrier of TFDCH (8,0) is used the line markings that has a down dip from upper left to the right, and the subcarrier of TFDCH (8,4) is used the line markings that has a down dip from upper right left.

From 8 OFDM code elements of L=0 to L=7 index, and from 32 subcarriers of n=0 to n=31 index each OFDM code element.

Comparison shows that between Fig. 3 and 4, TFDCH (8,0) is equal to TFDCH (4,0) with the combination of TFDCH (8,4).In other words, TFDCH (8,0) and TFDCH (8,4) can derive from TFDCH (4,0).This characteristic is the substantive characteristics of the physical channel indexing means of example embodiment of the present invention, as with peculiar mode shown in Figure 5.

Fig. 5 show according to first example embodiment of the present invention, represent in the classification of the tree structure shown in Fig. 4.

With reference to Fig. 5, produce a TFDCH for a physical channel result All Time-frequency resource allocation of a TTI, this TFDCH is TFDCH (1,0).Produce two TFDCH for two physical channel results All Time-frequency resource allocation, that is, TFDCH (2,0) and TFDCH (2,1), this two combination is equal to TFDCH (1,0).In the same way, TFDCH (4,0) and TFDCH (4,2) derive from TFDCH (2,0), and TFDCH (8,0) and TFDCH (8,4) derive from TFDCH (4,0).Above-mentioned reasoning extends to other TFDCH shown in Fig. 5.

As stated; The TFDCH of different length can be configured to have the time-frequency resources in TTI; And for example (N k) comes index TFDCH to make things convenient for the information that between transmitter and receiver, exchanges about the resource that is used for the specific physical channel to utilize the node corresponding value.To describe example with reference to Fig. 6 simultaneously.

Fig. 6 show according to first example embodiment of the present invention, with the corresponding TFDCH of a plurality of physical channels of the different length that in a TTI, is re-used.

With reference to Fig. 6, TFDCH (4,0), TFDCH (4,2) and TFDCH (4,1) are used separately as the PDCH that is used for user A, B and C.The TFDCH (8,3) and the TFDCH (8,7) that are derived by TFDCH (4,3), have length 8 separately are assigned as CCCH and PDCCH respectively.

Down in the face of according to more example embodiment of the present invention, how to define, expression and Resources allocation allocation units describe.

In example embodiment of the present invention, two kinds of method definition and the expression resource allocation unit about 2 dimension resources (that is a plurality of T/F lattice in TTI) is arranged.One of them is distributed resource channel (DRCH) method, and in the method, channel is configured to have the resource by scattering regularly and representing.Another kind is local channel resource (LRCH) method, and in the method, channel is configured to have adjacent resource and be expressed.By the resource allocation unit of DRCH and LRCH method definition be expressed as respectively DRCH (N, k) with LRCH (N, k), and through be provided with DRCH (N, k) and LRCH (N, N in k) and k with resource allocation to each physical channel.At first will (N k) describes with reference to Fig. 7 and 8 couples of DRCH.

Fig. 7 show according to second example embodiment of the present invention, (N k) carries out index to physical channel with DRCH.DRCH (N, k) corresponding with N the k group of organizing of (scattered) time-frequency resources that has the distributed or distribution in TTI separately.

With reference to Fig. 7,8 OFDM code elements 703 are present among the TTI 704.From L=0 to L=7 index OFDM code element.Each OFDM code element 703 has by 32 subcarriers from n=0 to n=31 index.For N=8, reference number 701 and 702 represent respectively with the corresponding resource of DRCH (8,0) and with the corresponding resource of DRCH (8,4).Give DRCH (8,0) with resource allocation in the following manner.

In each OFDM code element, 32 subcarriers are organized into groups N group (that is, among Fig. 78 groups), and each group has the equidistance subcarrier.Particularly, for group #0, the index of subcarrier is n={0,8,16,24}.For group #1, n={1,9,17,25}.For group #2, n={2,10,18,26}; For group #3, n={3,11,19,27}; For group #4, n={4,12,20,28}; For group #5, n={5,13,21,29}; For group #6, n={6,14,22,30}; And for group #7, n={7,15,23,31}.N=8 in this example, the subcarrier of each group in each OFDM code element on the characteristic is being each interval equidistance in frequency domain.Confirm the time-frequency resources of DRCH (8,0) according to the peculiar sequence of BS (BS-specific sequence) S.Sequence S have with each TTI in the element of OFDM code element equal amount.

In situation shown in Figure 7, sequence S={0,3,1,7,2,6,4,5}.This sequence table is shown in employed group index in each OFDM code element.For having S={0,3,1; 7,2,6; 4; The BS of 5}, the time-frequency resources of DRCH (8,0) in TTI are group #0, the group #3 among the OFDM code element #1, the group #1 among the OFDM code element #2, the group #7 among the OFDM code element #3, the group #2 among the OFDM code element #4, the group #6 among the OFDM code element #5, the group #4 among the OFDM code element #6 and the group #5 among the OFDM code element #7 among the OFDM code element #0.

If express, then when BS use sequence S={0,3,1,7 with the vague generalization form; 2,6,4, during 5}, by { (0+k) %N; (3+k) %N, (1+k), (7+k) %N, (2+k) %N; (6+k) %N, (4+k) %N, (5+k) DRCH in the order OFDM code element that is assigned at TTI of the represented group of %N} (8, k).

Therefore, in Fig. 7, with 4%8,7%8,5%8,11%8,6%8,10%8,8%8, corresponding group of 9%8}, for example, 4,7,5,3,6,2,0,1}, the DRCH (8,4) in the order OFDM code element that is assigned at TTI.

Fig. 8 show according to second example embodiment of the present invention, at S={0,1,2,3,4,5,6, during 7} to the resource allocation of DRCH (8,0) and DRCH (8,4).

With reference to Fig. 8, above-mentioned resource allocation methods relates to resource allocation and ordered pair (N, distribution k) of confirming to use the DRCH method.With tree structure form these ordered pairs (N, k) so that in TTI, be used for the time-frequency resources of the physical channel of different channels length can be by sign effectively.

At present will with reference to Fig. 4 and 7 pairs as how tree structure index DRCH describe.With reference to Fig. 7, be present in the TTI 704 by 8 OFDM code elements 703 from L=0 to L=7 index.With reference to Fig. 4, each OFDM code element comprises the subcarrier of 32 quilts from n=0 to n=31 index simultaneously.As top said about Fig. 4, DRCH (8,0) 701 is equal to DRCH (4,0) with the combination of DRCH (8,4) 702.In the same way, for S={0,3,1,7,2,6,4,5}, DRCH (4,0) is configured as follows.

Because N=4, thus the subcarrier of each OFDM code element be divided into from 0 to 3 carry out index 4 groups, each group has the equidistance subcarrier.The N mould (modulo-N) of the element of S (N=4)

operation result produce

3,1,3,2,2,0, and 1} and with this as a result sequence be assigned to DRCH (4,0) for corresponding group.The combination of the subcarrier of the subcarrier of DRCH (4,0) and DRCH (8,0) 701 and DRCH (8,4) 702 is identical, as shown in Figure 7.In other words, DRCH (8,0) and DRCH (8,4) are derived by DRCH (4,0).This tree structure has been shown in Fig. 9.

Fig. 9 show according to second example embodiment of the present invention, represent in the classification of the tree structure shown in Fig. 8.

With reference to Fig. 9, all time-frequency resources of a TTI are distributed to a physical channel result produce a DRCH, that is, and DRCH (1,0).Produce three DRCH for three physical channel results All Time-frequency resource allocation, DRCH (3,0), DRCH (3,1) and DRCH (3,2), this three's combination and DRCH (1,0) are identical.In the same way, DRCH (6,0) and DRCH (6,3) derive from DRCH (3,0).Above-mentioned reasoning extends to other DRCH shown in Fig. 9.

As stated; The DRCH of different length can be configured to have the time-frequency resources in TTI, and utilizes the node corresponding value, promptly; (N k) comes index DRCH to make things convenient for the information that between transmitter and receiver, exchanges about the resource that is used for particular physical channel.To describe example with reference to Figure 10.

Figure 10 show according to second example embodiment of the present invention, with the corresponding DRCH of a plurality of physical channels of the different length that in a TTI, is re-used.

With reference to Figure 10, DRCH (6,0), DRCH (6,3), DRCH (6,1) and DRCH (6,4) are used separately as PDCH 0 to PDCH 4.DRCH (12,2) is assigned to PDCCH, and DRCH (12,5) is assigned to CCCH.Through distribute DRCH (n, N and k in k), with above-mentioned resource allocation unit definition with method for expressing with resource allocation to each physical channel.It is existing that (N k) describes to LRCH with reference to Figure 11.

Figure 11 show according to the 3rd example embodiment of the present invention, (N is k) to the index of physical channel with LRCH.(N k) with separately organizes corresponding as the k of N group of the time-frequency resources of local (localized) among the TTI LRCH.

With reference to Figure 11,8 OFDM code elements 1105 are present among the TTI 1106.From L=0 to L=7 index OFDM code element.Each OFDM code element 1105 has by 32 subcarriers from n=0 to n=31 index.For N=4 and k=0, reference number 1101 representatives and the corresponding resource of LRCH (4,0).This resource is 64 subcarriers that in 8 OFDM code elements of TTI, have index n=0 to 7.Above 8 OFDM code elements of this TTI; 64 subcarriers with index n=8 to 15 are assigned to by the represented LRCH (4 of reference number 1102; 1) 64 subcarriers that, have an index n=16 to 23 are assigned to LRCH (4,2); And 64 subcarriers with index n=24 to 31 are assigned to LRCH (4,3).When with the same manner configuration LRCH (2,0), the combination of the resource of the resource of LRCH (2,0) and LRCH (4,0) and LRCH (4,1) is identical.

Above-mentioned LRCH tree structure shown in Figure 11 is similar in properties with the DRCH tree structure shown in Figure 10.LRCH (N k) can be divided into a plurality of groups in time, such as LRCH (m), wherein m is a time index for N, k, for example, the OFDM symbol index in TTI.The corresponding resource of LRCH (4,2,0) in reference number 1103 representatives and the OFDM code element.Similarly, LRCH (4,2,1) occupies the resource 1104 in the 2nd OFDM code element.Therefore, the combination of LRCH (4,2,0) and LRCH (4,2,1) is comprised among the LRCH (4,2).LRCH (N, k, m) can be used for when LRCH (N, multiplexing when being used for a plurality of user's data in k).

Figure 12 show according to the 3rd example embodiment of the present invention, represent in the classification of the tree structure shown in Figure 11.

With reference to Figure 12, produce a LRCH for a physical channel result All Time-frequency resource allocation of a TTI, it is LRCH (1,0).Produce two LRCH for two physical channel results All Time-frequency resource allocation, that is, LRCH (2,0) and LRCH (2,1), this two combination is identical with LRCH (1,0).In the same way, LRCH (4,2) and LRCH (4,3) derive from LRCH (2,1).Above-mentioned reasoning extends to other DRCH shown in Fig. 9.

With reference to Figure 13, transmitter 1300 comprises mission controller 1301, physical channel index 1303, professional (traffic) transmitter 1305 and OFDM transmitter 1307.

Mission controller 1301 is according to the physical channel indexing means of example embodiment of the present invention, is controlled at the multiplexing of a plurality of physical channels of having different length among the TTI.Physical channel index 1303 is physical channel index building information under the control of mission controller 1301.Professional transmitter 1305 will from other piece or more the business that receives of upper level node be stored in its internal buffer.OFDM transmitter 1307 makes up frame through multiplexing index information and Traffic Channel under the control of mission controller 1301.The functional element of the transmitter 1300 outside example embodiment scope of the present invention, for example, inverse fast fourier transform (Inverse Fast Fourier Transform, FFT), not shown in Figure 13.

Receiver 1310 comprises OFDM receiver 1311, physical channel index analyzer 1313, receives controller 1315 and professional receiver 1317.

OFDM receiver 1311 is from transmitter 1300 received frames, and under the control that receives controller 1315 this frame of demultiplexing.Physical channel index analyzer 1313 under the control that receives controller 1315 to analyzing about the index information of received physical channel.Receive the physical channel indexing means of controller 1315 according to example embodiment of the present invention, control is the physical channel with different length with the TTI demultiplexing.Professional receiver 1317 will be stored in from the business datum that OFDM receiver 1315 receives its internal buffer.The same with transmitter 1300, the functional element of the receiver 1310 outside example embodiment scope of the present invention does not illustrate in the drawings.

According to aforesaid example embodiment of the present invention; Owing in the OFDM wireless communication system, the physical channel with different length is configured and index, thereby can easily between transmitter and receiver, transmits the 2 dimension resources that are assigned to each physical channel with tree structure.

And example embodiment of the present invention provides the simple expression of the subcarrier that is assigned to each physical channel, thereby makes it possible to dispatch effectively and the utilization of resources.

Although the present invention is illustrated and describes with reference to given embodiment of the present invention; Those skilled in the art should understand; Do not breaking away under the condition of liking the defined the spirit and scope of the present invention of claim enclosed, can carry out various variations to it in form and details.

Claims

1. one kind is inserted the method for index physical channel in (OFDMA) system at OFDM; Insert in (OFDMA) system at said OFDM; An OFDM (OFDM) code element comprises a plurality of subcarriers and a Transmission Time Interval (TTI) comprises a plurality of OFDM code elements, and this method comprises the steps:

The subcarrier of the entire quantity of each OFDM code element is divided into N group;

Select the k group in N the group from each OFDM code element of TTI; (N k) carries out index to one group of corresponding physical channel of subcarrier in organizing with the k that is included in this TTI to utilize ordered pair; And

Through the index information and the Traffic Channel of multiplexing said physical channel, make up the frame that is used to launch.

2. the method for claim 1, wherein said selection step is confirmed by the skew of each OFDM code element; This skew is represented that by the peculiar sequence S in the base station with L element wherein L is included in the quantity of the OFDM code element among the said TTI, and S={S1; ..., SL}.

3. method as claimed in claim 2, wherein, said sequence S={S1 ..., SL} through (S1+k) %N ..., (SL+k) %N} calculates, wherein % represents modular arithmetic.

4. the method for claim 1; Wherein, When according to ordered pair (N; When the relation k) will sort with tree structure with the corresponding sub carrier groups of the physical channel behind the index, utilize the associating of sub carrier groups that adjacent sub-ordered pair carries out index with to utilize female ordered pair to carry out the sub carrier groups of index identical.

5. one kind is used for inserting (OFDMA) system index physical channel and with the transmitter of the emission of the physical channel behind the index at OFDM; Insert in (OFDMA) system at said OFDM; An OFDM (OFDM) code element comprises a plurality of subcarriers and a Transmission Time Interval (TTI) comprises a plurality of OFDM code elements, and this transmitter comprises:

Mission controller; Be used for the subcarrier of the entire quantity of each OFDM code element is divided into N group; Select the k group in N the group from each OFDM code element of TTI; (N k) one group of corresponding physical channel of subcarrier in organizing with the k that is included in this TTI is carried out index, and the physical channel behind the control index is multiplexing to utilize ordered pair;

The physical channel index is used under the control of said mission controller, making up the index information of said physical channel; With

The OFDM transmitter is used under the control of said mission controller, through the index information and the Traffic Channel of multiplexing said physical channel, makes up the frame to receiver to be launched.

6. transmitter as claimed in claim 5, said selection step confirms that by the skew of each OFDM code element this skew is represented by the peculiar sequence S in the base station with L element; Wherein L is included in the quantity of the OFDM code element among the said TTI; And S={S1 ..., SL}.

7. transmitter as claimed in claim 6, wherein, said sequence S={S1 ..., SL} through (S1+k) %N ..., (SL+k) %N} calculates, wherein % represents modular arithmetic.

8. transmitter as claimed in claim 5; Wherein, When according to ordered pair (N, when the relation between k) will sort with tree structure with the corresponding sub carrier groups of the physical channel behind the index, with the associating of the corresponding sub carrier groups of adjacent sub-ordered pair with identical corresponding to the sub carrier groups of female ordered pair.

One kind be used for after OFDM inserts (OFDMA) system reception hint physical channel and about the receiver of the information of the index of this physical channel; Insert in (OFDMA) system at said OFDM; An OFDM (OFDM) code element comprises a plurality of subcarriers and a Transmission Time Interval (TTI) comprises a plurality of OFDM code elements, and this receiver comprises:

The OFDM receiver is used under the control that receives controller, is the index information and the Traffic Channel of physical channel from the transmitter received frame and with received frame demultiplexing;

Physical channel index analyzer is used under the control of said reception controller, the index information of received physical channel being analyzed; And

Said reception controller is used to control the physical channel of demultiplexing from TTI; Each physical channel through following process by index: the subcarrier of the entire quantity of each OFDM code element is divided into N group; From N group of each OFDM code element of this TTI, select the k group; And (N is k) to carrying out index with the one group of corresponding physical channel of subcarrier that is included in the k group to utilize ordered pair.

10. the described receiver of claim 9, said selection step confirms that by the skew of each OFDM code element this skew is represented by the peculiar sequence S in the base station with L element; Wherein L is included in the quantity of the OFDM code element among the said TTI; And S={S1 ..., SL}.

11. receiver as claimed in claim 10, wherein, said sequence S={S1 ..., SL} through (S1+k) %N ..., (SL+k) %N} calculates, wherein % represents modular arithmetic.

12. receiver as claimed in claim 9; Wherein, When according to ordered pair (N; When the relation k) will sort with tree structure with the corresponding sub carrier groups of the physical channel behind the index, with the associating of the corresponding sub carrier groups of adjacent sub-ordered pair with identical corresponding to the sub carrier groups of female ordered pair.

13. the system of the physical channel after in OFDM inserts (OFDMA) system, transmitting and receiving index; Insert in (OFDMA) system at said OFDM; An OFDM (OFDM) code element comprises a plurality of subcarriers and a Transmission Time Interval (TTI) comprises a plurality of OFDM code elements, and this system comprises:

The base station; It comprises transmitter, and this transmitter is used for: the subcarrier of the entire quantity of each OFDM code element is divided into N group, selects the k group in N the group from each OFDM code element of this TTI; Utilize ordered pair (N; K) to carrying out index,, make up the frame that is used to launch through the index information and the Traffic Channel of multiplexing said physical channel with the one group of corresponding physical channel of subcarrier that is included in the k group; With

The terminal, it comprises receiver, and this receiver is used for from said transmitter received frame, and received frame demultiplexing is the index information and the Traffic Channel of physical channel.

14. system as claimed in claim 13, said selection step confirms that by the skew of each OFDM code element this skew is represented by the peculiar sequence S in the base station with L element; Wherein L is included in the quantity of the OFDM code element among the said TTI; And S={S1 ..., SL}.

15. system as claimed in claim 14, wherein, said sequence S={S1 ..., SL} through (S1+k) %N ..., (SL+k) %N} calculates, wherein % represents modular arithmetic.

16. system as claimed in claim 13; Wherein, When according to ordered pair (N; When the relation k) will sort with tree structure with the corresponding sub carrier groups of the physical channel behind the index, utilize the associating of sub carrier groups that adjacent sub-ordered pair carries out index with to utilize female ordered pair to carry out the sub carrier groups of index identical.

17. the method for an index physical channel in OFDM access (OFDMA) system; Insert in (OFDMA) system at said OFDM; An OFDM (OFDM) code element comprises a plurality of subcarriers and a Transmission Time Interval (TTI) comprises a plurality of OFDM code elements, and this method comprises the following steps:

The time-frequency resources of TTI is divided into N equidistance and local group, and (N k) organizes corresponding physical channel to the k in organizing with this N and carries out index to utilize ordered pair;

With this k group be divided into m equidistance group in time and utilize orderly tlv triple (N, k, m) to division after the corresponding physical channel of group carry out index; And

18. method as claimed in claim 17; Wherein, When according to ordered pair (N; When the relation k) will sort with tree structure with the corresponding sub carrier groups of the physical channel behind the index, utilize the associating of sub carrier groups that adjacent sub-ordered pair carries out index with to utilize female ordered pair to carry out the sub carrier groups of index identical.

19. one kind is used for inserting (OFDMA) system index physical channel and with the transmitter of the emission of the physical channel behind the index at OFDM; Insert in (OFDMA) system at said OFDM; An OFDM (OFDM) code element comprises a plurality of subcarriers and a Transmission Time Interval (TTI) comprises a plurality of OFDM code elements, and this transmitter comprises:

Mission controller is used for the time-frequency resources of TTI is divided into N equidistance and local group, utilizes ordered pair (N; K) k in organizing with this N is organized corresponding physical channel and carry out index; This k group is divided into m equidistance group in time, utilizes orderly tlv triple (N, k; M) to divide after the corresponding physical channel of group carry out index, and the physical channel behind the control index is multiplexing;

20. transmitter as claimed in claim 19; Wherein, When according to ordered pair (N; When the relation k) will sort with tree structure with the corresponding sub carrier groups of the physical channel behind the index, with the associating of the corresponding sub carrier groups of adjacent sub-ordered pair with identical corresponding to the sub carrier groups of female ordered pair.

21. one kind be used for after OFDM inserts (OFDMA) system reception hint physical channel and about the receiver of the information of the index of this physical channel; Insert in (OFDMA) system at said OFDM; An OFDM (OFDM) code element comprises a plurality of subcarriers and a Transmission Time Interval (TTI) comprises a plurality of OFDM code elements, and this receiver comprises:

Said reception controller is used to control the physical channel of demultiplexing from TTI; Each physical channel through following process by index: the time-frequency resources of TTI is divided into N equidistance and local group, and (N k) organizes corresponding physical channel to the k in organizing with this N and carries out index to utilize ordered pair; This k group is divided into m equidistance group in time; And utilize orderly tlv triple (N, k, m) to divide after the corresponding physical channel of group carry out index.

22. receiver as claimed in claim 21; Wherein, When according to ordered pair (N; When the relation k) will sort with tree structure with the corresponding sub carrier groups of the physical channel behind the index, with the associating of the corresponding sub carrier groups of adjacent sub-ordered pair and identical with the corresponding sub carrier groups of female ordered pair.

23. the system of the physical channel after in OFDM inserts (OFDMA) system, transmitting and receiving index; Insert in (OFDMA) system at said OFDM; An OFDM (OFDM) code element comprises a plurality of subcarriers and a Transmission Time Interval (TTI) comprises a plurality of OFDM code elements, and this system comprises:

The base station, it comprises transmitter, and this transmitter is used for: the time-frequency resources of TTI is divided into N equidistance and local group; (N k) organizes corresponding physical channel to the k in organizing with this N and carries out index, and this k group is divided into m equidistance group in time to utilize ordered pair; Utilize orderly tlv triple (N, k, m) to divide after the corresponding physical channel of group carry out index; And, make up the frame that is used to launch through the index information and the Traffic Channel of multiplexing said physical channel; With

24. system as claimed in claim 23; Wherein, When (N will be when the relation between k) will sort with tree structure with the corresponding sub carrier groups of the physical channel behind the index, with the associating of the orderly corresponding sub carrier groups of adjacent son and identical with the corresponding sub carrier groups of female ordered pair according to ordered pair.