CN108173631B - Method and device for transmitting uplink control information - Google Patents
Method and device for transmitting uplink control information Download PDFInfo
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- CN108173631B CN108173631B CN201611114199.6A CN201611114199A CN108173631B CN 108173631 B CN108173631 B CN 108173631B CN 201611114199 A CN201611114199 A CN 201611114199A CN 108173631 B CN108173631 B CN 108173631B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
- H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0078—Timing of allocation
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The application discloses that when User Equipment (UE) needs to send control information, the control information is sent to a base station by using short physical uplink control channel (sPCH) resources configured in a current subframe and an orthogonal spread spectrum code special for the UE; the sPUCCH resource adopts a subframe structure supporting a frequency hopping mode, wherein each short transmission time interval (sTTI) comprises two short time slots (sslot), each sslot comprises four OFDM symbols, the first and fourth OFDM symbols are demodulation reference signal (DMRS) symbols, the second and third OFDM symbols are data symbols for bearing control information, and the fourth OFDM symbol of each sTTI is shared by the fourth OFDM symbol of the first sslot and the first OFDM symbol of the second sslot of the sTTI in a code division multiplexing mode. By adopting the invention, the demodulation detection accuracy of the control information can be ensured.
Description
Technical Field
The present invention relates to mobile communication technologies, and in particular, to a method and an apparatus for transmitting uplink control information.
Background
The current 3GPP research scheme proposes a frame structure design concept of short Transmission Time Interval (TTI), and for frame structure type 1 and frame structure type 2 of LTE, uplink sPUCCH/sPUSCH all needs to support 2 symbol sTTI, 4 symbol sTTI, and 0.5ms (1 slot) sTTI. The PUCCH/PUSCH channel structure and design of LTE cannot be directly followed by sPUCCH/sPUSCH of sTTI, and therefore, the channel structure and design of sPUCCH/sPUSCH is one of the research hotspots of this project at present.
Due to the shortening of TTI, the time domain resource of sPUCCH is reduced by times, which brings the problems of performance reduction, coverage limitation and the like of sUCCH. As is well known, the frequency hopping technique can perfectly cope with the frequency selection characteristic of the wireless channel, and therefore, supporting the frequency hopping characteristic is one of the important technical means for improving the performance of the sPUCCH.
In the existing frame structure schemes for supporting the frequency hopping mode for the uplink control channel proposed for the sTTI, the sTTI is divided into two short slots (sslot). For a normal Cyclic Prefix (CP) radio frame, each 1-slot sTTI contains 7 OFDM symbols, meaning that the two sslots are of unequal length, typically consisting of 3 and 4 OFDM symbols, respectively. Referring to format 1/1a/1b of LTE, if 7 OFDM symbols of each slot include 3 DMRS symbols and 4 data symbols, this means that the number of demodulation reference signals (DMRSs) included in two sslot is 1 and 2 in sTTI, respectively. For a sslot including only 1 DMRS, the channel estimation performance of the sslot is reduced due to the small number of DMRSs, which inevitably affects the demodulation detection accuracy of the control information, thereby causing performance degradation of the entire system.
As can be seen from this, the conventional uplink control information transmission scheme proposed for the sTTI has a problem that the demodulation detection accuracy of the control information cannot be ensured.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for transmitting uplink control information, which can ensure the demodulation detection accuracy of the control information.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a method for transmitting uplink control information includes:
when User Equipment (UE) needs to send control information, the control information is sent to a base station by using short physical uplink control channel (sPUCCH) resources configured in a current subframe and an orthogonal spread spectrum code special for the UE;
the sPUCCH resource adopts a subframe structure supporting a frequency hopping mode, wherein each short transmission time interval (sTTI) comprises two short time slots (sslot), each sslot comprises four OFDM symbols, the first and fourth OFDM symbols are demodulation reference signal (DMRS) symbols, the second and third OFDM symbols are data symbols for bearing control information, and the fourth OFDM symbol of each sTTI is shared by the fourth OFDM symbol of the first sslot and the first OFDM symbol of the second sslot of the sTTI in a code division multiplexing mode.
An apparatus for transmitting uplink control information, comprising:
a transmission unit, configured to send control information to a base station by using short physical uplink control channel (sPCH) resources configured in a current subframe and an orthogonal spreading code dedicated to the UE when the UE needs to send the control information;
the sPUCCH resource adopts a subframe structure supporting a frequency hopping mode, wherein each short transmission time interval (sTTI) comprises two short time slots (sslot), each sslot comprises four OFDM symbols, the first and fourth OFDM symbols are demodulation reference signal (DMRS) symbols, the second and third OFDM symbols are data symbols for bearing control information, and the fourth OFDM symbol of each sTTI is shared by the fourth OFDM symbol of the first sslot and the first OFDM symbol of the second sslot of the sTTI in a code division multiplexing mode.
In summary, the method and apparatus for transmitting uplink control information provided by the present invention configure 2 DMRS symbols for each sslot, and enable the fourth OFDM symbol of the first sslot and the first OFDM symbol of the second sslot of each sTTI to share resources in a code division multiplexing manner, so as to ensure not only the demodulation detection accuracy of the control information, but also the user capacity of the uplink control channel, thereby ensuring the uplink transmission performance of the system.
Drawings
FIG. 1 is a schematic flow chart of a method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a sUCCH frequency hopping pattern subframe structure in 0.5ms (1 slot) sTTI according to the present invention;
fig. 3 is a schematic structural diagram of an apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The core idea of the invention is as follows: the subframe structure supporting the frequency hopping mode adopted by the uplink control channel is improved, and each sTTI is divided into two ssl (short slots), so that each ssl consists of 4 OFDM symbols, including two DMRS symbols. In this way, by configuring each ssl as 2 DMRS symbols, it is possible to ensure channel estimation performance when uplink control information is transmitted using the subframe structure, and thus it is possible to ensure demodulation detection accuracy of control information.
Fig. 1 is a schematic flowchart of a method according to an embodiment of the present invention, and as shown in fig. 1, the method for transmitting uplink control information implemented in the embodiment mainly includes:
The sPUCCH resource adopts a subframe structure supporting a frequency hopping mode, wherein each short transmission time interval (sTTI) comprises two short time slots (sslot), each sslot comprises four OFDM symbols, the first and fourth OFDM symbols are demodulation reference signal (DMRS) symbols, the second and third OFDM symbols are data symbols for bearing control information, and the fourth OFDM symbol of each sTTI is shared by the fourth OFDM symbol of the first sslot and the first OFDM symbol of the second sslot of the sTTI in a code division multiplexing mode.
In this step, different from the existing uplink control information transmission scheme, in the used sPUCCH subframe structure, each ssl includes two DMRS symbols, and the fourth OFDM symbol of each sTTI is shared by the fourth OFDM symbol of the first ssl and the first OFDM symbol of the second ssl in a code division multiplexing manner, as shown in the schematic diagram of the sPUCCH frequency hopping pattern subframe structure in the sTTI given in fig. 2. Thus, not only the demodulation detection accuracy of the control information can be ensured, but also the user capacity of the uplink control channel can be ensured through code division multiplexing.
Preferably, in the subframe structure of the sPUCCH resource, the fourth OFDM symbol of the first sslot and the first OFDM symbol of the second sslot of each sTTI are multiplexed in frequency using different cyclic shifts.
In practical applications, the number deltaPUCCH-Shift supported by the basic sequence on each OFDM symbol in sPUCCH may be configured by upper layer signaling and notified to the UE by broadcasting in SIB 2. The value range of deltaPUCCH-Shift can be (1, 2, 3), the number of corresponding cyclic shifts is 12, 6 and 4, and the sequences subjected to the cyclic shifts are mutually orthogonal. Thus two sslotts can multiplex the fourth symbol of sTTI by using different cyclic shifts, and the cyclic shift allocation of DMRS sequences of two sslotts is given in table 1 below:
TABLE 1
In this step, in order to cooperate with the subframe structure, each UE needs to use an orthogonal spreading code dedicated to the UE (i.e., the orthogonal spreading code of each UE is unique), and sends the control information to the base station, so that multiple UEs in each sslot can be supported to use different orthogonal spreading codes to perform time domain code division multiplexing, thereby ensuring that the user capacity of the uplink control channel is not reduced by the change of the subframe structure of the present invention.
Specifically, the orthogonal spreading codes dedicated to each UE may be dynamically configured by the system, and are not described herein again.
Preferably, in order to obtain the frequency diversity gain, the PRB resources of the first sslot and the second sslot of each sTTI in the subframe structure of the sPUCCH resources may be located at both ends of the available spectrum resources, respectively.
Fig. 3 is a schematic structural diagram of an uplink control information transmission apparatus corresponding to the foregoing method, and as shown in fig. 3, the apparatus includes:
a transmission unit, configured to send control information to a base station by using short physical uplink control channel (sPCH) resources configured in a current subframe and an orthogonal spreading code dedicated to the UE when the UE needs to send the control information;
the sPUCCH resource adopts a subframe structure supporting a frequency hopping mode, wherein each short transmission time interval (sTTI) comprises two short time slots (sslot), each sslot comprises four OFDM symbols, the first and fourth OFDM symbols are demodulation reference signal (DMRS) symbols, the second and third OFDM symbols are data symbols for bearing control information, and the fourth OFDM symbol of each sTTI is shared by the fourth OFDM symbol of the first sslot and the first OFDM symbol of the second sslot of the sTTI in a code division multiplexing mode.
Preferably, in the subframe structure of the sPUCCH resource, the fourth OFDM symbol of the first sslot and the first OFDM symbol of the second sslot of each sTTI are multiplexed in frequency using different cyclic shifts.
Preferably, the PRB resources of the first sslot and the second sslot of each sTTI in the subframe structure of the sPUCCH resource are located at two ends of the available spectrum resource respectively.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A method for transmitting uplink control information, comprising:
when User Equipment (UE) needs to send control information, the control information is sent to a base station by using short physical uplink control channel (sPUCCH) resources configured in a current subframe and an orthogonal spread spectrum code special for the UE;
the sPUCCH resource adopts a subframe structure supporting a frequency hopping mode, wherein each short transmission time interval (sTTI) comprises two short time slots (sslot), each sslot comprises four OFDM symbols, the first and fourth OFDM symbols are symbols for bearing demodulation reference signals (DMRS), the second and third OFDM symbols are data symbols for bearing control information, and the fourth OFDM symbol of each sTTI is shared by the fourth OFDM symbol of the first sslot and the first OFDM symbol of the second sslot of the sTTI in a code division multiplexing mode.
2. The method of claim 1, wherein the fourth OFDM symbol of the first sslot and the first OFDM symbol of the second sslot of each sTTI in the subframe structure of the sPCH resource are multiplexed in frequency using different cyclic shifts.
3. The method according to claim 1, wherein the PRB resources of the first sslot and the second sslot of each sTTI in the subframe structure of the sPUCCH resources are located at both ends of the available spectrum resources.
4. An apparatus for transmitting uplink control information, comprising:
a transmission unit, configured to send control information to a base station by using short physical uplink control channel (sPCH) resources configured in a current subframe and an orthogonal spreading code dedicated to the UE when the UE needs to send the control information;
the sPUCCH resource adopts a subframe structure supporting a frequency hopping mode, wherein each short transmission time interval (sTTI) comprises two short time slots (sslot), each sslot comprises four OFDM symbols, the first and fourth OFDM symbols are symbols for bearing demodulation reference signals (DMRS), the second and third OFDM symbols are data symbols for bearing control information, and the fourth OFDM symbol of each sTTI is shared by the fourth OFDM symbol of the first sslot and the first OFDM symbol of the second sslot of the sTTI in a code division multiplexing mode.
5. The transmission apparatus of claim 4, wherein the fourth OFDM symbol of the first sslot and the first OFDM symbol of the second sslot of each sTTI in the subframe structure of the sPCH resource are multiplexed in frequency using different cyclic shifts.
6. The transmission apparatus according to claim 4, wherein the PRB resources of the first sslot and the second sslot of each sTTI in the subframe structure of the sPCH resources are respectively located at two ends of the available spectrum resources.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611114199.6A CN108173631B (en) | 2016-12-07 | 2016-12-07 | Method and device for transmitting uplink control information |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611114199.6A CN108173631B (en) | 2016-12-07 | 2016-12-07 | Method and device for transmitting uplink control information |
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| Publication Number | Publication Date |
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| CN108173631A CN108173631A (en) | 2018-06-15 |
| CN108173631B true CN108173631B (en) | 2020-08-28 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103166880A (en) * | 2011-12-15 | 2013-06-19 | 中国移动通信集团公司 | Sending method and receiving method of uploading demodulating pilot frequency, base station and moving relay |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103166880A (en) * | 2011-12-15 | 2013-06-19 | 中国移动通信集团公司 | Sending method and receiving method of uploading demodulating pilot frequency, base station and moving relay |
Non-Patent Citations (3)
| Title |
|---|
| Design aspects of sPUSCH;Ericsson;《3GPP TSG-RAN WG1 #86 R1-167491》;20160826;全文 * |
| Design of UL channels for shortened TTI;Lenovo;《3GPP TSG RAN WG1 Meeting #85 R1-164650》;20160627;全文 * |
| Physical design aspects of sPUSCH;Ericsson;《3GPP TSG-RAN WG1 #85 R1-165296》;20160627;全文 * |
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