CN101005345A - Method for realizing down physical layer control channel of orthogonal frequency division multiplex system - Google Patents
Method for realizing down physical layer control channel of orthogonal frequency division multiplex system Download PDFInfo
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Abstract
The method includes steps: dividing all available frequency bands into multiple control sub frequency bands; based on information of channel quality fed back from each user terminal, base station assigns control information of each user terminal to each sub frequency band; unitive modulating and coding mode is adopted to carry out modulating and coding control information of all user terminals; multiplexing control channel and data channel of each user terminal in time domain, and transmission of control channel transferred before the data channel. The invention implements control channel of down going physical layer under orthogonal frequency division multiplex reasonably and effectively.
Description
Technical field
The present invention relates to OFDM (OFDM) system, relate in particular to a kind of implementation method of down physical layer control channel of ofdm system.
Background technology
In recent years, development along with the next generation wireless communication system, the OFDM technology demonstrates its powerful advantage, adopted by multiple standards, from European DAB (digital broadcasting), DVB (Digital Television) standard, U.S. high speed DSL modulation standard, to WLAN, WIMAX and LTE, ofdm system becomes the sign of the new generation of wireless communication technology.
The major technique advantage of ofdm system is the spectrum efficiency height, and the bandwidth autgmentability is strong, and anti-multipath decline ability is strong, is convenient to the flexible allocation frequency spectrum resource, is convenient to realize MIMO technology etc.
The physical layer control information mainly provides to user terminal and receives the necessary data transmission format of data, schedule information and mix automatic repeat requests (HARQ) control information etc., and, data transmission format, schedule information and the HARQ control information etc. of the relevant uplink that the down physical layer control information also provides the base station simultaneously and issued.
Whether the correct reception of physical layer control information, become the key that whether can correctly receive data-signal, thereby for effectively utilizing the communication resource in the ofdm system, the availability of frequency spectrum that improves system has important role.
Yet,,, therefore, rationally, the effective implementation method of physical layer control channel, also rare at present because the factor that need take all factors into consideration is more for the design of the down physical layer control channel of ofdm system.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of implementation method of down physical layer control channel of ofdm system, with rationally, effectively realize physical layer control channel.
For solving the problems of the technologies described above, the invention provides a kind of implementation method of down physical layer control channel of ofdm system, comprise the steps:
With all spendable frequency band division is a plurality of control sub-bands;
The base station is according to the channel quality information of each user terminal feedback, and the control information of each user terminal is distributed on each sub-band;
For the control information of all user terminals, adopt unified modulation and coded system to carry out modulating-coding;
The control channel and the data channel of each user terminal is multiplexing in time domain, and control channel transmitted before data channel.
Wherein, can further include: each user terminal is according to the channel quality information of preserving, all control sub-bands are carried out prioritization according to the quality of channel quality, and according to the priority information transmitted in the control sub-band that receives of decoding one by one, up to the control information that obtains this user terminal.
Wherein, the step of described control information at each each user terminal of subband allocation can be the order of quality according to the channel quality of each sub-band corresponding with this terminal, and the control information of each user terminal is distributed on each sub-band.
Wherein, the step of described control information at each each user terminal of subband allocation may further include: according to the size of each sub-band of described division, the control information of one or more user terminals is distributed in the sub-frequency bands.
Wherein, the step of described control information at each each user terminal of subband allocation may further include: be lower than the user terminal of predetermined threshold for channel quality information, the control information of this user terminal copied to repeat transmission on a plurality of different sub-bands.
Ofdm system downlink transfer control channel implementation method provided by the present invention, not only can utilize the frequency selective characteristic of physical channel well, carry out the relevant scheduling of channel, guarantee the transmission performance of control channel, and at the relatively poor user of channel condition, improve transmission performance by increasing frequency diversity and coding gain, to remedy the decreased performance of bringing owing to the variation of channel quality.Simultaneously, a plurality of users carry out combined coding, have improved subscriber-coded efficient.By dividing the auxiliary CQI information of sub-band and user, improve the efficient of its control channel of user search.In addition, extra signaling consumption is smaller, and can realize " microsleep " function of user terminal, satisfies the terminal power saving requirement.
Description of drawings
Fig. 1 be according to the described ofdm system downlink transfer of embodiment of the invention control channel the time, the frequency domain distribution schematic diagram.
Embodiment
The design of physical layer control channel implementation method, its objective is that the physical layer control information of will be carried is arranged in when limited rationally, effectively, frequency domain resource, thereby reach the correct reception that to guarantee the physical layer control information, reduce the shared overhead of control channel again as far as possible.
The problem that must consider when carrying out the control channel design has: correct modulation and the coded system selected, guaranteeing to utilize the characteristic of radio communication channel frequency selection effect under the prerequisite that control information is correctly decoded, improve the availability of frequency spectrum as far as possible; The presence of intercell interference of being born that reduces the user who is positioned at cell boarder is to improve its transmission performance; Channel estimating is compared the performance loss that the ideal communication channel estimation is brought in the actual transmissions process; Support subscriber terminal equipment as far as possible " microsleep " process, be that user terminal can be after the decoding control channel, whether acquisition comprises the information that sends to this user data in this subframe, do not send to this user's data as if not comprising in this subframe, then in this subframe data transmission period sheet thereafter, user terminal can receive and wait relevant device to be set to resting state, thereby reduces terminal power consumption.In addition, need consider that also the control information amount that each user transmits handles the performance of different size coding pieces with coding method, thereby improve code efficiency, reduce overhead simultaneously, perhaps carry out flexible allocation through-put power between each user.
Therefore, embodiments of the invention have related generally to following technology:
1, the control channel of each user terminal and data channel are in time-domain multiplexed, and control channel and pilot channel transmitted before data channel.
2,, adopt unified modulation system and coded system (being coding method and encoding rate etc.) for the control information of different user.Concrete modulation and coded system are selected according to different system conditions and channel conditions.
3, but all service bands are divided into a plurality of control sub-bands.According to the size of sub-band, each sub-band can transmit one or more users' control information simultaneously.A plurality of users' control information can be merged into an encoding block and encode, and the control channel of a plurality of users in each control sub-band is distinguished by the user label information bit.
4, the base station channel quality information that utilizes user terminal to feed back carries out the relevant scheduling of channel, promptly according to the user in the difference channel condition constantly and the requirement of service quality etc., each user's control information is distributed on the sub-band of channel quality the best.Here, in some cases, also need to consider the capacity of open ended subscriber control information in this sub-band, if be assigned a plurality of users' control information on the sub-band of this channel quality the best, in the time of can not having held more subscriber control information, just can only be according to the quality of channel quality, this user's control information is distributed in the inferior good sub-band corresponding with it.By that analogy, until being assigned to suitable sub-band.
On the other hand, terminal is preserved CQI information, when receiving, in order to locate the sub-band at its control information place rapidly, all control sub-bands are carried out prioritization according to the quality of channel quality, according to priority decode one by one control sub-band in information transmitted, up to the control information of obtaining this user.
5, for the user who is in high-speed motion or cell edge, this user's control information will repeat transmission at different control sub-bands, increase auxiliary control bit simultaneously, and the existence that identifies the control information piece that duplicates whether.
Should be noted that the utilization in embodiments of the present invention of above-mentioned every technology, do not have clear and definite sequencing, just for various aspects of the invention process are described.
In addition, adopt a precondition of the present invention to be: terminal is obtained channel quality information (CQI) by measurement, and this information is fed back to the base station by uplink, is the main foundation that the relevant scheduling of channel is carried out in the base station.
For the more detailed specific implementation method of illustrating above-mentioned technology, be example with the design parameter in the 3GPP Long Term Evolution mobile communication cell system (LTE) below, the present invention is described.
As shown in Figure 1, establishing the whole system bandwidth is 5MHz, removes protection frequency band and direct current (DC) subcarrier, comprises 300 useful subcarriers altogether, is used for transmitting control channel, pilot channel and user data channel.300 subcarriers are divided into 5 control sub-bands, and each control sub-band comprises 60 subcarriers, and promptly sub-carrier separation is 15KHz, altogether 900KHz.Such control sub-band can transmit two control informations after subscriber-coded simultaneously, comprises the CRC part.In each control sub-band, each subcarrier through-put power is consistent.
Control channel, pilot channel and data channel are in the time-domain multiplexed (see figure 1), and control channel and pilot channel are positioned at two OFDM symbols of each subframe, to realize ' microsleep ' technology.In some cases, may need additional assist control information, these control informations are also nonessential in each subframe transmission, and for example MIMO is provided with etc.These control informations will be transmitted jointly with radio bearer, and their existence is indicated by the master control channel.
Be scheduled in all users that this subframe sends data, its control information uses identical modulation and coded system to transmit, and adopts (the Turbo coding of QPSK modulation and 1/2 encoding rate) here.Need to prove, can select suitable modulation and coded system according to different system conditions and channel conditions.
The relevant scheduling of channel is carried out according to the channel quality information of user feedback in the base station in scheduling process, the modulation and the coded system of each user's control information do not change.Simultaneously, terminal is when receiving control channel, under the situation of the sub-band information at this user's control channel place not, can be according to the CQI information of being preserved, according to channel quality conditions each control sub-band is provided with retrieval priority, according to priority information transmitted in the demodulation sign indicating number control sub-band one by one, up to the control information of obtaining this user.
On each control sub-band, two users' control information is merged into an encoding block and is encoded, in order to distinguish the user's who belongs to different control information, distribute specific user label position for each user by high level by signaling, utilize the user label position that the control information of different user is distinguished by methods such as masks.
Be in poor channel condition for the user and (promptly be lower than certain threshold value, this thresholding can set in advance), the channel variation that is positioned at the situation of cell edge or user as user terminal is very fast, perhaps the user is positioned under the high velocity environment, these users' control information will be copied on the different control sub-bands, improve transmission performance by increasing frequency diversity and coding gain.
In addition, adjust the subcarrier through-put power, can improve the availability of frequency spectrum and decoding performance by self adaptation.
Claims (11)
1, a kind of implementation method of down physical layer control channel of ofdm system is characterized in that, comprises the steps:
With all spendable frequency band division is a plurality of control sub-bands;
The base station is according to the channel quality information of each user terminal feedback, and the control information of each user terminal is distributed on each sub-band;
For the control information of all user terminals, adopt unified modulation and coded system to carry out modulating-coding;
The control channel and the data channel of each user terminal is multiplexing in time domain, and control channel transmitted before data channel.
2, the method for claim 1, it is characterized in that, further comprise: each user terminal is according to the channel quality information of preserving, all control sub-bands are carried out prioritization according to the quality of channel quality, and according to the priority information transmitted in the control sub-band that receives of decoding one by one, up to the control information that obtains this user terminal.
3, the method for claim 1, it is characterized in that, the step of described control information at each each user terminal of subband allocation is the order of quality according to the channel quality of each sub-band corresponding with this terminal, and the control information of each user terminal is distributed on each sub-band.
4, method as claimed in claim 3 is characterized in that, the step of described control information at each each user terminal of subband allocation is that control information with each user terminal is distributed on the sub-band with this terminal corresponding channel quality the best.
5, the method for claim 1, it is characterized in that, the step of described control information at each each user terminal of subband allocation further comprises: according to the size of each sub-band, the control information of one or more user terminals is distributed in the sub-frequency bands.
6, method as claimed in claim 5, it is characterized in that, the control information of described a plurality of user terminals is merged into an encoding block and encodes, and distributes specific user label position for each user by high level by signaling, utilizes the user label position that the control information of different user is distinguished.
7, the method for claim 1, it is characterized in that, the step of described control information at each each user terminal of subband allocation, further comprise: be lower than the user terminal of predetermined threshold for channel quality information, the control information of this user terminal copied to repeat transmission on a plurality of different sub-bands.
8, method as claimed in claim 7, it is characterized in that, described control information with this user terminal copies to the step that repeats to transmit on a plurality of different sub-bands, further comprises: be identified at whether there is described control information of duplicating on this sub-band in the auxiliary controlled flag position of increase on the sub-band.
9, the method for claim 1 is characterized in that, modulation that described employing is unified and coded system are carried out the step of modulating-coding, is according to concrete system condition and channel conditions, selects the modulation and the coded system that are fit to.
10, the method for claim 1, it is characterized in that, described channel multiplexing and transmitting step further comprise: control channel, pilot channel and the data channel of each user terminal is multiplexing in time domain, and control channel and pilot channel transmitted before data channel.
11, method as claimed in claim 10 is characterized in that, described control channel and pilot channel are positioned at preceding two OFDM symbols of each subframe.
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| WO2009089766A1 (en) * | 2008-01-07 | 2009-07-23 | Huawei Technologies Co., Ltd. | Method for wireless resources allocation and reception, apparatus thereof |
| WO2010012156A1 (en) * | 2008-07-28 | 2010-02-04 | 大唐移动通信设备有限公司 | Method, system and device for data transmission |
| CN102055564A (en) * | 2010-12-24 | 2011-05-11 | 清华大学 | Spatial multiplexing method for network coding of physical layer |
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| CN102148666A (en) * | 2010-02-09 | 2011-08-10 | 华为技术有限公司 | Channel information feedback method, terminal and base station |
| CN101616103B (en) * | 2008-06-25 | 2012-07-18 | 中兴通讯股份有限公司 | Method for indicating mobile terminal to control channel information and method for controlling channel blind detection |
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