CN101299736B - Method and system for implementing channel quality indication information transmission, subscriber terminal and base station - Google Patents
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Abstract
The invention discloses an information transmission method, a system, a user terminal and a base station for realizing the channel quality indication, wherein the information includes the steps: receiving the distributing information of the CQI information of each user terminal; respectively modulating the CQI information of each user terminal into the initial symbol with the length smaller than N, wherein N is the number of used sub-carrier included in each OFDM symbols of the time frequency source; extending the initial symbol corresponding to each user terminal into the signals for transmission with the length N according to the distributing information; transmitting the signals for transmission. The embodiment of the invention differentiates the different terminal through the position, or the extended code and the identification code for transmitting the CQI information, thereby increasing the terminal number that can be held on the CQI source, to support further terminals to transmit the CQI information at the same time.
Description
Technical Field
The present invention relates to the field of information transmission, and in particular, to a method and a system for implementing channel quality indicator information transmission, a user terminal, and a base station.
Background
Fig. 1 is a schematic flow diagram of CQI information transmission in the prior art, and referring to fig. 1, in an existing CQI (Channel Quality Indicator) information transmission technology, a base station allocates an uplink time-frequency resource to a terminal, and the terminal sends CQI information on the time-frequency resource. In this technique, one subframe is divided into two slots, and in each slot, the CQI time-Frequency resource consists of 12 consecutive subcarriers on 7 Orthogonal Frequency Division Multiplexing (OFDM) symbols. The resources on the middle 3 OFDM symbols in the CQI time-frequency resources are used for transmitting pilot frequency information and are called pilot frequency resources; the resources located on the other 4 OFDM symbols are used to transmit the true CQI information, referred to as data resources.
Uplink CQI information of a terminal is modulated and encoded into 12 Quadrature Phase Shift Keying (QPSK) symbols, and subjected to Discrete Fourier Transform (DFT) to output 12 signals. These 12 signals are subjected to Inverse Fast Fourier Transform (IFFT) processing to obtain a first time domain sample signal of one OFDM symbol, and the first time domain sample signal is subjected to Walsh code BLOCK SPREADING (BLOCK SPREADING) to obtain a second time domain sample signal of 4 OFDM symbols.
The base station can assign a plurality of users to transmit respective CQI information on the same CQI time-frequency resource and transmit the CQI information through Walsh codes (W)0W1W2W3) To distinguish which user the CQI information came from, the Walsh code is used to identify the user. Since the data resource is only 4 OFDM symbols, the Walsh code length is limited, which also limits the number of Walsh codes. The 4 OFDM symbols of the data resource determine that the Walsh code is 4 in length, and Walsh has only 4 codes to choose from, i.e., this approach can accommodate only 4 users in total (note: the Walsh code is 2 in length)nThe number of Walsh codes of a certain length is the same as the length thereof, for example, the number of Walsh codes of length 4 is 4, and the number of Walsh codes of length 2 is 2).
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art:
the conventional CQI transmission technology described above can accommodate a small number of users, and when there are many users who need to transmit CQI information, the technology cannot simultaneously support more users to transmit CQI information.
Disclosure of Invention
The embodiment of the invention provides a method and a system for realizing the transmission of channel quality indication information, a user terminal and a base station, and supports more user terminals to transmit CQI information at the same time.
The method for realizing the transmission of the Channel Quality Indicator (CQI) information comprises the following steps:
receiving allocation information of CQI information of each user terminal;
respectively modulating the CQI information of each user terminal into initial symbols with the length less than N, wherein the length N is the number of used subcarriers included in each orthogonal frequency division multiplexing OFDM symbol in time-frequency resources;
according to the distribution information, the initial symbols corresponding to each user terminal are expanded into signals with the length of N and used for transmission;
and sending the signal for transmission.
A user terminal, comprising:
a receiving unit, configured to receive allocation information of CQI information of the user terminal;
a coding unit, configured to modulate CQI information of the ue into an initial symbol with a length smaller than N according to the allocation information, where the length N is the number of used subcarriers included in each OFDM symbol in the time-frequency resource;
an extension unit, configured to extend the initial symbol into a signal with a length of N for transmission according to the allocation information;
a transmitting unit for transmitting a signal for transmission.
A base station, comprising:
an allocation unit configured to generate allocation information of CQI information for each user terminal;
a receiving unit for receiving signals for transmission from respective user terminals;
and the analysis unit is used for analyzing and obtaining the CQI information of each user terminal from the signals used for transmission of each user terminal according to the distribution information.
A system for enabling transmission of CQI information, comprising:
the user terminals are respectively used for modulating the CQI information of the user terminals into initial symbols with the length smaller than N, expanding the initial symbols into signals with the length of N for transmission and sending the signals according to corresponding distribution information, wherein the length of N is the number of used subcarriers contained in each orthogonal multiplexing OFDM symbol in time-frequency resources;
and the base station is used for receiving the signals used for transmission of each user terminal and obtaining the CQI information of each user terminal according to the corresponding distribution information.
The embodiment of the invention distinguishes different terminals through the position or the spreading code of the transmitted CQI information and the identification code, thereby increasing the number of terminals which can be accommodated on the CQI resource and supporting more terminals to transmit the CQI information at the same time.
Drawings
Fig. 1 is a flow diagram of a prior art transmission of CQI information;
fig. 2 is a flow chart illustrating transmission of CQI information according to an embodiment of the present invention;
fig. 3 is a flow chart of CQI information transmission according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a system for implementing CQI information transmission according to an embodiment of the present invention.
Detailed Description
In the first scheme, the base station allocates part of the resources in the time frequency resources to the terminal, and specifies an identification code used by the terminal to identify a user, which is used for sending CQI information, wherein the identification code is an orthogonal code, the length of the orthogonal code is equal to the number of OFDM symbols included in the data resources in the time frequency resources, and the orthogonal code can be a code composed of any row element of a DFT transform matrix of the order of the OFDM symbols; when the length of the orthogonal code is 2n, the orthogonal code may employ a Walsh code of a corresponding length. And the terminal transmits the CQI information processed by the identification code on the allocated partial resource in the CQI time-frequency resource. When receiving, the base station distinguishes the users through the identification codes and the positions of the time frequency resources occupied by the users, receives the CQI information of the corresponding users on different sub-resources in the time frequency resources, and distinguishes the user information through the identification codes and the positions, so that more users can be supported to send the CQI information at the same time.
Referring to fig. 3, CQI information of a terminal is modulated and encoded into an initial symbol with a length less than N, where the length N is the number of used subcarriers included in each OFDM symbol in time-frequency resources; in this embodiment, the length N is equal to 12, the CQI information is modulated and encoded into 6 QPSK symbols, and may be in other lengths as long as the length is less than N, and meanwhile, the Walsh code with the length of 4 is used as the identification code in this embodiment. After the 6 QPSK symbols are DFT, 6 signals are output, and 12 signals are formed by filling 0 in the unassigned positions. The 12 signals are subjected to IFFT processing to obtain a first time domain sampling signal of one OFDM symbol, the first time domain sampling signal is subjected to Block Spreading (Block Spreading) with Walsh codes to obtain a second time domain sampling signal of 4 OFDM symbols, and the second time domain sampling signal is processed and transmitted to the base station. And the base station receives the CQI information of all the terminals on the data resource in the time slot (subframe), and obtains the CQI information of each terminal according to the position of each terminal in each OFDM symbol, which is appointed by the base station and is less than N subcarriers, and the identifier carried by each user.
Second kindIn the scheme, a base station appoints a terminal to use a spreading code and an identification code for sending CQI information, the spreading code is used for spreading a symbol obtained after modulation coding of the CQI information of the terminal, the spreading code can be realized by adopting an orthogonal code, and a code consisting of any row element of a multiple-order DFT transformation matrix needing spreading can be adopted as the spreading code; when the expansion factor is 2nIn time, a Walsh code with the length of a multiple to be spread can be used as a spreading code; the terminal transmits the CQI information processed by the spreading code and the identification code on the block of CQI time-frequency resources. During receiving, the base station distinguishes users through the combination of the spreading codes and the identification codes, and receives the CQI information of the corresponding users on the time-frequency resource. Therefore, the scheme can also support more users to simultaneously transmit the CQI information.
Referring to fig. 3, CQI information of a terminal is coded and modulated into symbols having a length of N/2 or less, and in the present embodiment, a first Walsh code having a length of 2 is used as a spreading code, a second Walsh code having a length of 4 is used as an identification code, and the CQI information of the terminal is modulated into 6 QPSK symbols. The 6 QPSK symbols are spread by the first Walsh code to obtain 12 QPSK symbols, and the 12 QPSK symbols are DFT-transmitted to output 12 signals. The 12 signals are processed by IFFT to obtain a first time domain sampling signal of one OFDM symbol, the first time domain sampling signal is processed by block spreading of a second Walsh code to obtain a second time domain sampling signal of 4 OFDM symbols, and the second time domain sampling signal is processed and then sent to a base station. The base station receives the CQI information of all terminals on the data resource in the time slot (sub-frame), and obtains the CQI information of each terminal according to the two Walsh codes carried by each terminal.
In the third scheme, the base station designates the terminal to use the spreading code and the identification code for sending the CQI information, the spreading code is used for spreading the symbols obtained after modulation coding of the CQI information of the terminal, and may be implemented by using an orthogonal code, or may use a code composed of any row element in a DFT transform matrix with an order equal to a spreading multiple, when the multiple to be spread is 2nWhen the spreading codes are the same, the Walsh codes with the length equal to multiple can be adopted as the spreading codes; the terminal transmits the spread code and identification on the CQI time-frequency resourceCode processed CQI information. During receiving, the base station distinguishes users through the combination of the spreading codes and the identification codes, and receives the CQI information of the corresponding users on the time-frequency resource. Therefore, the scheme can also support more users to simultaneously transmit the CQI information.
Referring to fig. 2, CQI information of a terminal is modulation-encoded into symbols having a length of N/2 or less, and in the present embodiment, a first Walsh code having a length of 2 is used as a spreading code, a second Walsh code having a length of 4 is used as an identification code, and the CQI information of the terminal is modulated into 6 QPSK symbols. The 6 QPSK symbols are DFT-processed and then output 6 signals, the 6 signals are spread by a first Walsh code to obtain 12 signals, the 12 signals are IFFT-processed to obtain a first time-domain sampled signal of one OFDM symbol, the first time-domain sampled signal is block-spread by a second Walsh code to obtain a second time-domain sampled signal of 4 OFDM symbols, and the second time-domain sampled signal is processed and then transmitted to the base station. The base station receives the CQI information of all terminals on the data resource in the time slot (sub-frame), and obtains the CQI information of each terminal according to the two Walsh codes carried by each terminal.
Specific examples will be described below.
Embodiment one of the first scheme:
and on the data time-frequency resource, every two sub-carriers are separated to form one sub-resource. The base station informs the terminal: the terminal occupies the sub-resources of the data time-frequency resources and specifies the Walsh code used by the terminal for the terminal to send CQI information.
The CQI information of the terminal is modulated and coded into 6 QPSK symbols, 6 signals are output after DFT, the terminal puts the 6 signals according to the position appointed by the base station, 0 is inserted into other 6 positions to form 12 signals; the 12 signals are processed by IFFT to obtain a time domain sampling signal of one OFDM symbol, the time domain sampling signal is processed by block spreading of Walsh codes to obtain time domain sampling signals of 4 OFDM symbols, and the time domain sampling signals of the 4 OFDM symbols are processed and then sent to a base station.
The base station receives the CQI information of all the terminals on the data resource, and obtains the CQI information of each terminal according to the position of a part of subcarriers appointed by the base station of each OFDM symbol of each terminal and the Walsh code of the terminal.
Example two of the first scheme:
on the data time-frequency resource, 6 continuous sub-carriers form one sub-resource. The base station informs the terminal: the terminal occupies the sub-resources of the data time-frequency resources and specifies the Walsh code used by the terminal for the terminal to send CQI information.
The CQI information of the terminal is modulated and coded into 6 QPSK symbols, 6 signals are output after DFT, the terminal puts the 6 signals according to the position appointed by the base station, 0 is inserted into other 6 positions to form 12 signals; the 12 signals are processed by IFFT to obtain a time domain sampling signal of one OFDM symbol, the time domain sampling signal is processed by block spreading of Walsh codes to obtain time domain sampling signals of 4 OFDM symbols, and the time domain sampling signals of the 4 OFDM symbols are processed and then sent to a base station.
Embodiment one of the second scheme:
in this embodiment, the length N is 12, the CQI information of the terminal is modulated and encoded into a symbol with a length of 6, which needs to be spread by 2 times, a Walsh code with a length of 2 may be used as the spreading code, and a Walsh code with a length of 4 may be used as the identification code.
The CQI information of the terminal is modulated and encoded into 6 QPSK symbols, the 6 QPSK symbols are spread by a spreading code to obtain 12 complex symbols, and the 12 complex symbols are DFT-processed and output 12 signals. The 12 signals are processed by IFFT to obtain a first time domain sampling signal of one OFDM symbol, the first time domain sampling signal is processed by the block expansion of the identification code to obtain a second time domain sampling signal of 4 OFDM symbols, and the second time domain sampling signal is processed and then sent to the base station. And the base station receives the CQI information of all the terminals on the data resource in the time slot (subframe), and obtains the CQI information of each terminal according to the spreading code and the identification code carried by each terminal.
Example two of the second scheme:
in this embodiment, the length N is 12, the CQI information of the terminal is modulated and encoded into a symbol with a length of 4, and needs to be spread by 3 times, a code composed of any row element in a 3-order DFT transform matrix may be used as a spreading code, and an orthogonal code with a length of 6 is used as the identification code.
The CQI information of the terminal is modulated and encoded into 4 QPSK symbols, the 4 QPSK symbols are spread by a spreading code to obtain 12 complex symbols, and the 12 complex symbols are DFT-processed and output 12 signals. The 12 signals are processed by IFFT to obtain a first time domain sampling signal of one OFDM symbol, the first time domain sampling signal is processed by block expansion of the identification code to obtain a second time domain sampling signal of 6 OFDM symbols, and the second time domain sampling signal is processed and then sent to the base station. And the base station receives the CQI information of all the terminals on the data resource in the time slot (subframe), and obtains the CQI information of each terminal according to the spreading code and the identification code carried by each terminal.
Embodiment one of the third scheme:
in this embodiment, the length N is 12, the CQI information of the terminal is modulated and encoded into a symbol with a length of 6, which needs to be spread by 2 times, a Walsh code with a length of 2 may be used as the spreading code, and a Walsh code with a length of 4 may be used as the identification code.
CQI information of the terminal is modulated into 6 QPSK symbols. The 6 QPSK symbols are DFT-processed and then output 6 signals, the 6 signals are spread by spreading codes to obtain 12 signals, the 12 signals are IFFT-processed to obtain a first time-domain sampled signal of one OFDM symbol, the first time-domain sampled signal is block-spread by an identification code to obtain a second time-domain sampled signal of 4 OFDM symbols, and the second time-domain sampled signal is processed and then transmitted to the base station. And the base station receives the CQI information of all the terminals on the data resource in the time slot (subframe), and obtains the CQI information of each terminal according to the spreading code and the identification carried by each terminal.
Example two of the third protocol:
in this embodiment, the length N is 24, the CQI information of the terminal is modulated and encoded into a symbol with a length of 4, and needs to be spread by 6 times, a code composed of any row element in a 6-order DFT transform matrix may be used as a spreading code, and an orthogonal code with a length of 5 is used as the identification code.
CQI information of the terminal is modulated into 4 QPSK symbols. The 4 QPSK symbols are DFT-processed and then output 4 signals, the 4 signals are spread by spreading codes to obtain 24 signals, the 24 signals are IFFT-processed to obtain a first time-domain sampled signal of one OFDM symbol, the first time-domain sampled signal is block-spread by an identification code to obtain a second time-domain sampled signal of 5 OFDM symbols, and the second time-domain sampled signal is processed and then transmitted to the base station. And the base station receives the CQI information of all the terminals on the data resource in the time slot (subframe), and obtains the CQI information of each terminal according to the spreading code and the identification carried by each terminal.
In the embodiment of the invention, different terminals are distinguished by the position or the spreading code of the transmitted CQI information and the identification code, thereby increasing the number of terminals which can be accommodated on the CQI resource and supporting more terminals to transmit the CQI information at the same time.
Referring to fig. 4, a method corresponding to an embodiment of the present invention provides a system for implementing CQI information transmission, including:
n, the user terminals 1, are respectively configured to modulate CQI information of the user terminals into an initial symbol with a length smaller than N, and then expand the initial symbol into a signal with a length of N for transmission and transmit the signal according to corresponding allocation information, where the length N is the number of used subcarriers included in each OFDM symbol in a time-frequency resource;
and the base station A is used for receiving the signals used for transmission of each user terminal and obtaining the CQI information of each user terminal according to the corresponding distribution information.
Wherein each user terminal comprises
A receiving unit 11, configured to receive allocation information of CQI information of the user terminal;
a coding unit 12, configured to modulate CQI information of the ue into an initial symbol with a length smaller than N according to the allocation information;
an extension unit 13, configured to extend the initial symbol into a signal with a length N for transmission according to the allocation information;
a sending unit 14, configured to send a signal for transmission.
Base station A, comprising:
an allocation unit a1 configured to generate allocation information of CQI information for each user terminal;
a receiving unit a2 for receiving signals for transmission from respective user terminals;
analyzing unit a3, configured to analyze, according to the allocation information, CQI information of each user terminal from signals used for transmission of each user terminal.
It will be understood by those skilled in the art that all or part of the steps in the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, where the program may be stored in a computer readable storage medium, and when executed, the program includes the following steps: receiving allocation information of CQI information of each user terminal; respectively modulating the CQI information of each user terminal into initial symbols with the length less than N, wherein the length N is the number of used subcarriers included in each orthogonal frequency division multiplexing OFDM symbol in time-frequency resources; according to the distribution information, the initial symbols corresponding to each user terminal are expanded into signals with the length of N and used for transmission; sending the signal for transmission; the storage medium, such as: ROM/RAM, magnetic disk, optical disk, etc.
The method and system for sending the channel quality indication information, the user terminal and the base station provided by the invention are introduced in detail, and a specific example is applied in the text to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (8)
1. The method for realizing the transmission of the channel quality indicator CQI information is characterized by comprising the following steps:
receiving allocation information of CQI information of each user terminal;
respectively modulating the CQI information of each user terminal into initial symbols with the length less than N, wherein the length N is the number of used subcarriers included in each orthogonal frequency division multiplexing OFDM symbol in time-frequency resources;
according to the distribution information, the initial symbols corresponding to each user terminal are expanded into signals with the length of N and used for transmission;
sending the signal for transmission;
wherein:
the allocation information comprises resource positions of CQI information of each terminal and an identification code for identifying a user, and the length of the identification code is the number of OFDM symbols included in data resources in time-frequency resources; or,
the allocation information comprises spreading codes and identification codes of all terminals, the spreading codes are used for spreading symbols obtained after modulation coding of CQI information of the terminals, the identification codes are used for identifying users, the length of the identification codes is the number of OFDM symbols included in data resources in time-frequency resources, and the length of the initial symbols is less than or equal to N/2;
further:
the resource position of the CQI information of each terminal specifically includes a position of each terminal at less than N subcarriers specified by the base station of each OFDM symbol;
when the allocation information includes the resource position of the CQI information of each terminal and an identification code for identifying a user, and the length of the identification code is the number of OFDM symbols included in the data resource in the time-frequency resource: the step of expanding the initial symbols corresponding to each ue to a signal with length N for transmission according to the allocation information specifically includes:
after a certain initial symbol is subjected to Discrete Fourier Transform (DFT), an initial signal corresponding to the resource position is obtained;
filling 0 in the resource position which is not allocated to the initial signal to obtain an extended signal with the length of N;
the spread signal is subjected to Inverse Fast Fourier Transform (IFFT) processing to obtain a first time domain sampling signal;
the first time domain sampling signal is subjected to block expansion of the identification code to obtain a second time domain sampling signal, and the second time domain sampling signal is the signal for transmission;
when the allocation information includes spreading codes and identification codes of each terminal, the spreading codes are used for spreading symbols obtained by modulating and coding CQI information of the terminals, the identification codes are used for identifying users, the length of the identification codes is the number of OFDM symbols included in data resources in time-frequency resources, and the length of the initial symbols is less than or equal to N/2: the step of expanding the initial symbols corresponding to each ue to a signal with length N for transmission according to the allocation information specifically includes:
spreading a certain initial symbol by the spreading code to obtain a spread signal with the length of N;
outputting a first signal after the spread signal is subjected to DFT;
the first signal is subjected to IFFT processing to obtain a first time domain sampling signal;
the first time domain sampling signal is subjected to block expansion of the identification code to obtain a second time domain sampling signal, and the second time domain sampling signal is the signal for transmission; or,
after a certain initial symbol is subjected to DFT, outputting a first signal;
the first signal is spread by the spreading code to obtain a spread signal with the length of N;
the extended signal is processed by IFFT to obtain a first time domain sampling signal;
and the first time domain sampling signal is subjected to block expansion of the identification code to obtain a second time domain sampling signal, and the second time domain sampling signal is the signal for transmission.
2. The method of claim 1, further comprising the steps of:
and the base station receives the signal for transmission and obtains the CQI information of each user terminal according to the distribution information.
3. The method of claim 1, wherein the spreading code is an orthogonal code.
4. The method of claim 3, wherein the spreading code is a code consisting of any row element of a multiple-order DFT transform matrix to be spread.
5. A method according to claim 3, characterized in that the factor to be expanded is 2nThe spreading code is a Walsh code of the same length as the multiple to be spread.
6. The method of claim 1, wherein the identification code is an orthogonal code.
7. The method of claim 6, wherein the identification code is a code consisting of any row element of a DFT transform matrix of an order of OFDM symbols.
8. Method according to claim 6, characterized in that when the length of the identification code is 2nAnd the identification codes are Walsh codes with the same length.
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| CN1662097A (en) * | 2004-02-26 | 2005-08-31 | 三星电子株式会社 | Method and apparatus for controlling transmission of channel quality information |
| CN1938975A (en) * | 2004-04-07 | 2007-03-28 | 三星电子株式会社 | Apparatus and method for switching between an amc mode and a diversity mode in a broadband wireless communication |
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| CN1662097A (en) * | 2004-02-26 | 2005-08-31 | 三星电子株式会社 | Method and apparatus for controlling transmission of channel quality information |
| CN1938975A (en) * | 2004-04-07 | 2007-03-28 | 三星电子株式会社 | Apparatus and method for switching between an amc mode and a diversity mode in a broadband wireless communication |
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Application publication date: 20081105 Assignee: APPLE Inc. Assignor: HUAWEI TECHNOLOGIES Co.,Ltd. Contract record no.: 2015990000755 Denomination of invention: Method and system for implementing channel quality indication information transmission, subscriber terminal and base station Granted publication date: 20130102 License type: Common License Record date: 20150827 |
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