Signal enhancement coverage method and system based on CRS retransmission technology

Abstract

The invention provides a signal enhancement coverage method and system based on a CRS retransmission technology, and the method comprises the steps: additionally distributing a doubled frequency domain position resource on the basis that a base station carries out the CRS signal transmission according to a frequency domain position and a time domain position specified by an LTE protocol, and repeatedly transmitting the CRS signal at the increased frequency domain resource position; and demodulating and combining the CRS signals received twice at the corresponding time domain and frequency domain positions of the terminal. Through the CRS retransmission technology, the redundancy of the CRS and the demodulation capability of the terminal equipment are remarkably improved, and the problem that the demodulation capability of the CRS is insufficient in an ultra-far coverage scene is effectively solved. According to the method, the coverage range of the base station can be remarkably expanded, the bit error rate can be reduced, channel estimation can be optimized, wide applicability and practicability are achieved, and a new solution is provided for application of the LTE technology in special scenes.

Description

Technical Field

[0001] The present invention relates to the field of LTE mobile communication technology, and in particular to a signal enhancement coverage method and system based on CRS retransmission technology. Background Art

[0002] LTE (Long Term Evolution) is a 3GPP long-term evolution project. Its main advantages are high peak rates, low system latency, and support for flexible bandwidth configuration, which promises broad application prospects.

[0003] However, in offshore applications, the site selection of offshore base stations is strictly restricted by coastal topography and island locations, resulting in a limited number of base stations and the need to maximize coverage. Furthermore, in offshore applications, where the number of users is relatively small, the coverage of a single base station should be maximized to reduce the difficulty of site selection. In this scenario, high-power CPE is required to improve uplink coverage, but downlink coverage becomes a bottleneck. The Cell Reference Signal (CRS) is a cell reference signal in the LTE system, used by user equipment (UE) for downlink channel quality and channel estimation. However, in ultra-long-range coverage scenarios, the UE's ability to demodulate the CRS is significantly affected, resulting in degraded signal quality, increased bit error rates, and even communication interruption. Traditional CRS transmission methods, which only transmit signals in the frequency and time domains specified by the LTE protocol, cannot meet the requirements of ultra-long-range coverage scenarios. In traditional transmission scenarios, the CRS signal lacks redundancy, making it difficult for UEs to accurately demodulate the CRS in weak signal conditions, thus affecting the accuracy of channel estimation and data transmission reliability. To address this issue, this method provides a method for improving coverage distance based on LTE retransmission technology. Summary of the Invention

[0004] In view of this, the present invention proposes a signal enhancement coverage method and system based on CRS retransmission technology to solve the problems existing in the above-mentioned prior art.

[0005] On the one hand, to achieve the above-mentioned object, the present invention proposes a signal enhancement coverage method based on CRS retransmission technology, characterized by comprising:

[0006] On the basis of transmitting CRS signals according to the frequency domain position and time domain position specified by the LTE protocol, the base station allocates double the frequency domain position resources and repeatedly transmits CRS signals at the additional frequency domain resource positions;

[0007] The two received CRS signals are demodulated and combined at the corresponding time domain and frequency domain positions of the terminal.

[0008] Furthermore, in the two antenna ports, the method of additionally allocating frequency domain positions is as follows:

[0009] Based on the provisions of the LTE protocol, on port 0, each RB uses the 1st, 2nd and 7th, 8th REs of symbol 0, the 4th, 5th and 10th, 11th REs of symbol 4, the 1st, 2nd and 7th, 8th REs of symbol 7, and the 4th, 5th and 10th, 11th REs of symbol 11 to send CRS. On port 1, each RB uses the 4th, 5th and 10th, 11th REs of symbol 0, the 1st, 2nd and 7th, 8th REs of symbol 4, the 4th, 5th and 10th, 11th REs of symbol 7, and the 1st, 2nd and 7th, 8th REs of symbol 11 to send cell reference signals, and the cell reference signal sequence is repeated on the newly added REs.

[0010] Furthermore, the process of demodulating and combining the two received CRS signals at corresponding time domain and frequency domain positions of the terminal includes:

[0011] Signal demodulation is performed at the corresponding time domain and frequency domain positions corresponding to the LTE protocol, and signal demodulation is performed at the newly added time domain and frequency domain positions at the same time, and the cell reference signals of the two demodulations are combined and processed on the terminal.

[0012] Furthermore, the merging processing method includes but is not limited to signal superposition, averaging or maximum ratio combining.

[0013] On the other hand, to achieve the above-mentioned object, the present invention proposes a signal enhancement coverage system based on CRS retransmission technology, characterized in that it includes a signal transmitting base station and a signal receiving terminal;

[0014] The signal sending base station is used to send CRS signals according to the frequency domain position and time domain position specified in the LTE protocol, and additionally allocate twice the frequency domain position resources, and repeatedly send CRS signals at the increased frequency domain position resource positions;

[0015] The signal receiving terminal is used to demodulate and combine the two received CRS signals at corresponding time domain and frequency domain positions.

[0016] Furthermore, the signal receiving terminal performs signal demodulation at the corresponding time domain and frequency domain positions corresponding to the LTE protocol, and simultaneously performs signal demodulation at the newly added time domain and frequency domain positions, and combines the twice demodulated cell reference signals on the terminal.

[0017] Furthermore, the signal receiving terminal performs signal combining processing using methods including but not limited to signal superposition, averaging or maximum ratio combining.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention proposes a signal enhancement coverage method and system based on CRS retransmission technology. By allocating double the frequency domain location resources at the base station end and repeatedly transmitting the CRS signal at these newly added locations, the redundancy of the CRS signal is significantly improved. When receiving, the terminal device can not only demodulate the CRS at the time domain and frequency domain locations specified by the LTE protocol, but also demodulate the CRS at the newly added locations and merge the two demodulated signals, which can effectively improve the demodulation capability, especially in weak signal environments, and can significantly reduce the bit error rate and improve the reliability of communication.

[0020] The present invention is not only suitable for ultra-long-distance coverage scenarios such as at sea, but can also be widely used in other scenarios that require enhanced signal coverage, such as mountainous areas and remote areas, and has wide applicability and practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Various other advantages and benefits will become apparent to those skilled in the art by reading the detailed description of the preferred embodiment below. The accompanying drawings are only for the purpose of illustrating the preferred embodiment and are not to be considered as limiting the present invention. In the accompanying drawings:

[0022] Figure 1 This is a flow chart of the signal enhancement coverage method based on CRS retransmission technology proposed in the present invention;

[0023] Figure 2 A schematic diagram of signal transmission according to the time domain and frequency domain positions specified in the LTE protocol in an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of repeating signal transmission by doubling the frequency position in an embodiment of the present invention. DETAILED DESCRIPTION

[0025] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, unless there is a conflict, the embodiments of the present disclosure and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein may also be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of any conflict with any incorporated document, the contents of this specification shall prevail.

[0027] In the LTE system, the terminal demodulates CRS to determine the downlink channel quality and perform downlink channel estimation. However, in ultra-long coverage scenarios, the terminal's demodulation of CRS will be affected. The present invention adopts CRS retransmission technology to improve the terminal's demodulation of CRS in ultra-long coverage.

[0028] like Figure 1 As shown, the signal enhancement coverage method based on the CRS retransmission technology proposed in this embodiment includes the following steps:

[0029] 1. In Unit 101, the process begins;

[0030] 2. In the 102-unit, the base station sends the CRS signal in the time and frequency domain positions specified by the LTE protocol. Taking 2 antenna ports as an example, the time and frequency resources of CRS are as follows: Figure 2 shown.

[0031] 3. In unit 103, in addition to the frequency domain positions sent above, double the frequency domain position resources are allocated to CRS, and CRS is repeatedly sent at the added frequency domain resource positions;

[0032] Taking 2 antenna ports as an example, the added blue and orange parts in the figure below are the added CRS time-frequency resources. Figure 3 shown.

[0033] Figure 3 This is only a preferred implementation method, and other ResourceElements may also be selected for the added CRS time-frequency resources.

[0034] 4. In unit 104, the terminal demodulates the CRS at corresponding time domain and frequency domain positions.

[0035] The terminal demodulates the CRS at the time domain and frequency domain positions corresponding to the LTE protocol, and demodulates the CRS at the newly added time domain and frequency domain positions, and combines the two demodulated CRSs on the terminal.

[0036] 5. In Unit 105, the use case ends.

[0037] The specific implementation modes are described in detail below, but are not intended to limit the present invention.

[0038] Taking two antenna ports as an example, the LTE protocol stipulates that on port 0, each RB uses the 1st and 7th REs of symbol 0, the 4th and 10th REs of symbol 4, the 1st and 7th REs of symbol 7, and the 4th and 10th REs of symbol 11 to send CRS. On port 1, each RB uses the 4th and 10th REs of symbol 0, the 1st and 7th REs of symbol 4, the 4th and 10th REs of symbol 7, and the 1st and 7th REs of symbol 11 to send CRS.

[0039] The present invention increases the number of transmitted REs. At port 0, each RB uses the 1st, 2nd, 7th, and 8th REs of symbol 0, the 4th, 5th, 10th, and 11th REs of symbol 4, the 1st, 2nd, 7th, and 8th REs of symbol 7, and the 4th, 5th, 10th, and 11th REs of symbol 11 to transmit a CRS. At port 1, each RB uses the 4th, 5th, 10th, and 11th REs of symbol 0, the 1st, 2nd, 7th, and 8th REs of symbol 4, the 4th, 5th, 10th, and 11th REs of symbol 7, and the 1st, 2nd, and 7th, and 8th REs of symbol 11 to transmit a CRS. The CRS sequence is repeatedly transmitted on the newly added REs.

[0040] The present invention comprises the following steps:

[0041] Step 1: The base station sends a CRS signal in the time domain and frequency domain positions specified by the LTE protocol.

[0042] Taking two antenna ports as an example, the LTE protocol stipulates that on port 0, each RB uses the 1st and 7th REs of symbol 0, the 4th and 10th REs of symbol 4, the 1st and 7th REs of symbol 7, and the 4th and 10th REs of symbol 11 to send CRS. On port 1, each RB uses the 4th and 10th REs of symbol 0, the 1st and 7th REs of symbol 4, the 4th and 10th REs of symbol 7, and the 1st and 7th REs of symbol 11 to send CRS.

[0043] Step 2: In addition to the frequency domain positions sent above, double the frequency domain position resources are allocated to the CRS, and the CRS is repeatedly sent at the increased frequency domain resource positions.

[0044] On port 0, each RB uses the 2nd and 8th REs of symbol 0, the 5th and 11th REs of symbol 4, the 2nd and 8th REs of symbol 7, and the 5th and 11th REs of symbol 11 to send CRS. On port 1, each RB uses the 5th and 11th REs of symbol 0, the 2nd and 8th REs of symbol 4, the 5th and 11th REs of symbol 7, and the 2nd and 8th REs of symbol 11 to send CRS, and the CRS sequence is repeated on the newly added REs.

[0045] In step 3, the terminal demodulates the CRS at the time domain and frequency domain positions corresponding to the LTE protocol, and demodulates the CRS at the newly added time domain and frequency domain positions. The two demodulated CRSs are combined on the terminal to improve the demodulation capability.

[0046] By adopting the method described in the present invention, the terminal's ability to demodulate CRS in ultra-long-range coverage can be improved, further increasing the coverage distance.

[0047] Based on the above method, this embodiment further proposes a signal enhancement coverage system based on CRS retransmission technology, including a signal transmitting base station and a signal receiving terminal;

[0048] The signal sending base station is used to send CRS signals according to the frequency domain position and time domain position specified in the LTE protocol, and additionally allocate twice the frequency domain position resources, and repeatedly send CRS signals at the increased frequency domain position resource positions;

[0049] The signal receiving terminal is used to demodulate and combine the two received CRS signals at corresponding time domain and frequency domain positions.

[0050] As a preferred embodiment, the signal receiving terminal performs signal demodulation at the corresponding time domain and frequency domain positions corresponding to the LTE protocol, and simultaneously performs signal demodulation at the newly added time domain and frequency domain positions, and combines the twice demodulated cell reference signals on the terminal.

[0051] As a preferred embodiment, the signal receiving terminal performs signal combining processing including but not limited to signal superposition, averaging or maximum ratio combining.

[0052] This embodiment proposes a signal enhancement coverage method and system based on CRS retransmission technology. By allocating twice the additional frequency domain location resources at the base station end and repeatedly transmitting the CRS signal at these newly added locations, the redundancy of the CRS signal is significantly improved. When receiving, the terminal device can not only demodulate the CRS at the time domain and frequency domain locations specified by the LTE protocol, but also demodulate the CRS at the newly added locations and merge the two demodulated signals, which can effectively improve the demodulation capability, especially in weak signal environments, and can significantly reduce the bit error rate and improve the reliability of communication.

[0053] The present invention is not only suitable for ultra-long-distance coverage scenarios such as at sea, but can also be widely used in other scenarios that require enhanced signal coverage, such as mountainous areas and remote areas, and has wide applicability and practicality.

[0054] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. The systems disclosed in the embodiments are described briefly because they correspond to the methods disclosed in the embodiments. For relevant details, refer to the method description.

[0055] Those skilled in the art will appreciate that embodiments of the present invention may be provided as systems or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0056] The present invention is described with reference to flowcharts and / or block diagrams of computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0057] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0058] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A signal enhancement coverage method based on CRS retransmission technology, characterized in that: include: On the basis of transmitting CRS signals according to the frequency domain position and time domain position specified by the LTE protocol, the base station allocates double the frequency domain position resources and repeatedly transmits CRS signals at the additional frequency domain resource positions; The two received CRS signals are demodulated and combined at the corresponding time domain and frequency domain positions of the terminal.

2. The signal enhancement coverage method based on CRS retransmission technology according to claim 1, characterized in that: The method of allocating additional frequency domain positions in two antenna ports is as follows: Based on the provisions of the LTE protocol, on port 0, each RB uses the 1st, 2nd and 7th, 8th REs of symbol 0, the 4th, 5th and 10th, 11th REs of symbol 4, the 1st, 2nd and 7th, 8th REs of symbol 7, and the 4th, 5th and 10th, 11th REs of symbol 11 to send CRS. On port 1, each RB uses the 4th, 5th and 10th, 11th REs of symbol 0, the 1st, 2nd and 7th, 8th REs of symbol 4, the 4th, 5th and 10th, 11th REs of symbol 7, and the 1st, 2nd and 7th, 8th REs of symbol 11 to send cell reference signals, and the cell reference signal sequence is repeated on the newly added REs.

3. The signal enhancement coverage method based on CRS retransmission technology according to claim 1, characterized in that: The process of demodulating and combining the two received CRS signals at the corresponding time domain and frequency domain positions of the terminal includes: Signal demodulation is performed at the corresponding time domain and frequency domain positions corresponding to the LTE protocol, and signal demodulation is performed at the newly added time domain and frequency domain positions at the same time, and the cell reference signals of the two demodulations are combined and processed on the terminal.

4. The signal enhancement coverage method based on CRS retransmission technology according to claim 1, characterized in that: The merging processing method includes but is not limited to signal superposition, averaging or maximum ratio combining.

5. A signal enhancement coverage system based on CRS retransmission technology, characterized in that: It includes a signal sending base station and a signal receiving terminal; The signal sending base station is used to send CRS signals according to the frequency domain position and time domain position specified in the LTE protocol, and additionally allocate twice the frequency domain position resources, and repeatedly send CRS signals at the increased frequency domain position resource positions; The signal receiving terminal is used to demodulate and combine the two received CRS signals at corresponding time domain and frequency domain positions.

6. The signal enhancement coverage system based on CRS retransmission technology according to claim 5, characterized in that: The signal receiving terminal performs signal demodulation at the corresponding time domain and frequency domain positions corresponding to the LTE protocol, and simultaneously performs signal demodulation at the newly added time domain and frequency domain positions, and combines the twice demodulated cell reference signals on the terminal.

7. The signal enhancement coverage system based on CRS retransmission technology according to claim 5, characterized in that: The signal receiving terminal performs signal combining processing including but not limited to signal superposition, averaging or maximum ratio combining.

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