A channel estimation enhancement method based on harq-ack reserved resource

Abstract

The application relates to a channel estimation enhancement method based on HARQ-ACK reserved resources, which comprises the following steps: receiving a MAC scheduling message and judging whether the MAC scheduling message satisfies a channel estimation enhancement condition; if the MAC scheduling message satisfies the channel estimation enhancement condition, determining a time domain starting position of a hybrid automatic repeat request acknowledgement (HARQ-ACK) according to the symbol position of a reference signal, and calculating the reserved resource position of the HARQ-ACK according to a channel state information first part (CSI-Part1) in the MAC scheduling message and the bit number of the HARQ-ACK; filling the reserved resource position with data "0" according to the bit number of the HARQ-ACK; and performing channel estimation according to the reference signal resource and the resource with data "0" in the reserved resource position. The application can improve the channel estimation quality without increasing the pilot resource.

Description

Technical Field

[0001] This invention relates to the field of wireless communication technology, and in particular to a channel estimation enhancement method based on HARQ-ACK reserved resources. Background Technology

[0002] In wireless communication systems, channel estimation is a crucial component of the receiver. 5G and other wireless communication technologies employ reference signal-based channel estimation, where the receiver uses known information to estimate the channel. A commonly used method is pilot symbol-based channel estimation in OFDM systems. However, its drawbacks are obvious: too few pilot symbols may lead to inaccurate channel estimation, while too many pilot symbols result in the reference signal consuming excessive information bits, reducing channel transmission efficiency and wasting bandwidth. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a channel estimation enhancement method based on HARQ-ACK reserved resources, which can improve the channel estimation quality without increasing pilot resources.

[0004] The technical solution adopted by this invention to solve its technical problem is: to provide a channel estimation enhancement method based on HARQ-ACK reserved resources, comprising the following steps:

[0005] Receive a MAC scheduling message and determine whether the MAC scheduling message satisfies the channel estimation enhancement conditions;

[0006] If the MAC scheduling message satisfies the channel estimation enhancement condition, the time domain start position of the Hybrid Automatic Repeat Request Acknowledgment Response (HARQ-ACK) is determined according to the symbol position of the reference signal, and the reserved resource position of the Hybrid Automatic Repeat Request Acknowledgment Response (HARQ-ACK) is calculated according to the first part of the channel state information (CSI-Part1) in the MAC scheduling message and the number of bits of the Hybrid Automatic Repeat Request Acknowledgment Response (HARQ-ACK).

[0007] The reserved resource location is filled with data "0" according to the number of bits of the HARQ-ACK (Hybrid Automatic Repeat Request Acknowledgment) response;

[0008] Channel estimation is performed based on the reference signal resources and the resources with data of "0" in the reserved resource locations.

[0009] The channel estimation enhancement condition is as follows: the MAC scheduling message contains only the first part of channel state information (CSI-Part1), without the uplink shared channel (UL-SCH) and the second part of channel state information (CSI-Part2), and the bit data of the hybrid automatic repeat request acknowledgment response (HARQ-ACK) is less than 2 bits.

[0010] The step of determining the time-domain start position of the Hybrid Automatic Repeat Request Acknowledgment (HARQ-ACK) based on the symbol position of the reference signal is specifically: taking the data symbol after the first consecutive reference signal symbol in the time domain as the time-domain start position of the HARQ-ACK.

[0011] The reserved resource positions are filled with data "0" according to the number of bits of the Hybrid Automatic Repeat Request Acknowledgment (HARQ-ACK). Specifically: if the HARQ-ACK is 0 bits, then all reserved resource positions are filled with data "0"; if the HARQ-ACK is 1 bit, then the resources occupied by the HARQ-ACK are removed from the reserved resource positions, and the remaining reserved resource positions are filled with data "0".

[0012] Beneficial effects

[0013] By adopting the above-mentioned technical solution, the present invention has the following advantages and positive effects compared with the prior art: The present invention utilizes data information other than the reference signal for channel estimation, and then combines it with the existing reference signal for channel estimation to achieve the purpose of improving the quality of channel estimation, or to reduce the resources for transmitting the reference signal while meeting the requirements of channel estimation quality, thereby achieving the purpose of improving transmission efficiency. Attached Figure Description

[0014] Figure 1 This is a flowchart of the channel estimation enhancement method based on HARQ-ACK reserved resources according to an embodiment of the present invention;

[0015] Figure 2 This is a schematic diagram of the reserved resource locations in an embodiment of the present invention. Detailed Implementation

[0016] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0017] This invention relates to a channel estimation enhancement method based on HARQ-ACK reserved resources. When control information is transmitted on the PUSCH channel, only the first part of the channel state information (CSI-Part1) is present, without the uplink shared channel (UL-SCH) and the second part of the channel state information (CSI-Part2), and the bit data of the hybrid automatic repeat request acknowledgment (HARQ-ACK) is less than 2 bits, 2 bits of resources are reserved for HARQ-ACK. Unused resource positions are filled with a fixed number of 0s. This method specifies that the symbol positions of the HARQ-ACK reserved resources do not overlap with the pilot symbol positions. In this case, the positions filled with 0s in the reserved resources can be used as pilots for channel estimation to improve channel estimation quality, or to reduce pilot resources and improve transmission efficiency. Specifically, the method includes the following steps:

[0018] Step 1, MAC scheduling message parsing:

[0019] Based on the MAC scheduling message, determine whether the two conditions of this scheme are met: Condition 1. There is CSI-Part1 on the PUSCH resource, but no UL-SCH and CSI-Part2; Condition 2. HARQ-ACK must be less than 2 bits, that is, 0 bits or 1 bit. If these conditions are met, the channel estimation enhancement method based on HARQ-ACK reserved resources can be enabled.

[0020] Step 2. HARQ-ACK resource calculation:

[0021] The time-domain start position of HARQ-ACK is determined based on the symbol position of the reference signal, and the reserved resource position of HARQ-ACK is calculated based on the number of bits (0 bits or 1 bit) of CSI-Part1 and HARQ-ACK in the scheduling message.

[0022] like Figure 2 As shown, taking one RB as an example, the number of HARQ-ACK bits is 0. Here, A is the CSI-Part1 resource location, B is the reference signal resource location, and C is the HARQ-ACK reserved resource location. The specific method for determining the reserved resource location is as follows:

[0023] HARQ-ACK mapping begins with the data symbols following the first consecutive DMRS symbol in the time domain and cannot be mapped on subsequent DMRS symbols, such as... Figure 2 The third column is the DMRS symbol. HARQ-ACK starts mapping from the fourth column and will not map on the DMRS symbols in the seventh and tenth columns. The frequency domain mapping rules can be found in the calculation formulas of Step 1 and Step 5 in Section 6.2.7 of the 38.212 protocol.

[0024] When HARQ-ACK is less than 2 bits, all HARQ-ACKs are reserved at 2 bits. All resources other than those reserved for HARQ-ACK are allocated to CSI-Part1. For the specific resource calculation formula, refer to section 6.3.2.4 of protocol 38.212 for the rate matching formula.

[0025]

[0026] The number of HARQ-ACK resources after rate matching can be calculated using the above formula. This refers to the number of reserved resources when HARQ-ACK < 2. Then, using Step 1 and Step 5 of section 6.2.7 of the 38.212 protocol, the ACK reserved positions and the actual ACK positions can be calculated. After removing the actual ACK positions, all remaining reserved resource positions are filled with 0.

[0027] Step 3: Determine which resource locations among the reserved resource locations will transmit data 0:

[0028] Based on the calculated reserved resource locations, if the HARQ-ACK is 0 bits, then all reserved resource transmissions will be 0 data. If the HARQ-ACK is 1 bit, the resources occupied by the actual HARQ-ACK need to be removed from the reserved resource locations, and the remaining reserved resource transmissions will be 0 data. Figure 2 For example, the C bits in symbols 4 and 5 represent resource locations calculated based on a 2-bit reservation. If the actual number of ACK bits is 0, then all C bits in the diagram are filled with 0 according to the protocol. If the actual number of ACK bits is 1, then the space occupied by this 1 bit needs to be deducted from the reserved resource, and the remaining reserved resource is filled with 0. When the transmitter sends data 0 at a fixed reserved resource location, the receiver can treat it as a reference signal.

[0029] Step 4. Channel estimation:

[0030] Channel estimation is performed by combining reference signal resources and resources with zero data in the HARQ-ACK reserved resources, thereby achieving the goal of channel estimation enhancement.

[0031] It is not difficult to see that the present invention uses data information other than the reference signal for channel estimation, and then combines it with the existing reference signal for channel estimation to improve the quality of channel estimation, or reduce the resources for transmitting the reference signal while meeting the requirements of channel estimation quality, thereby improving transmission efficiency.

Claims

1. A channel estimation enhancement method based on HARQ-ACK reserved resources, characterized in that, Includes the following steps: Receive a MAC scheduling message and determine whether the MAC scheduling message satisfies the channel estimation enhancement conditions; The channel estimation enhancement condition is as follows: the MAC scheduling message contains only the first part of channel state information (CSI-Part1), without the uplink shared channel (UL-SCH) and the second part of channel state information (CSI-Part2), and the bit data of the hybrid automatic repeat request acknowledgment response (HARQ-ACK) is less than 2 bits. If the MAC scheduling message satisfies the channel estimation enhancement condition, the time domain start position of the Hybrid Automatic Repeat Request Acknowledgment Response (HARQ-ACK) is determined according to the symbol position of the reference signal, and the reserved resource position of the Hybrid Automatic Repeat Request Acknowledgment Response (HARQ-ACK) is calculated according to the first part of the channel state information (CSI-Part1) in the MAC scheduling message and the number of bits of the Hybrid Automatic Repeat Request Acknowledgment Response (HARQ-ACK). The reserved resource location is filled with data "0" according to the number of bits of the HARQ-ACK (Hybrid Automatic Repeat Request Acknowledgment) response; Channel estimation is performed based on the reference signal resources and the resources with data of "0" in the reserved resource locations.

2. The channel estimation enhancement method based on HARQ-ACK reserved resources according to claim 1, characterized in that, The step of determining the time-domain start position of the Hybrid Automatic Repeat Request Acknowledgment (HARQ-ACK) based on the symbol position of the reference signal is specifically: taking the data symbol after the first consecutive reference signal symbol in the time domain as the time-domain start position of the HARQ-ACK.

3. The channel estimation enhancement method based on HARQ-ACK reserved resources according to claim 1, characterized in that, The reserved resource positions are filled with data "0" according to the number of bits of the Hybrid Automatic Repeat Request Acknowledgment Response (HARQ-ACK). Specifically: if the HARQ-ACK is 0 bits, then all reserved resource positions are filled with data "0"; if the HARQ-ACK is 1 bit, then the resources occupied by the HARQ-ACK are removed from the reserved resource positions, and the remaining reserved resource positions are filled with data "0".

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