Discovery of signal and physical downlink shared channel multiplexing transmission and reception methods and devices

Abstract

A method and apparatus for multiplexing and transmitting / receiving a Discovery Signal (LAA) DRS and a Physical Downlink Shared Channel (PDSCH) are disclosed. During a data transmission period, a base station determines the subframes in the data transmission period where the DRS is transmitted. The base station then multiplexes the PDSCH transmission on these subframes, or multiplexes the PDSCH transmission only on subframes 0 and / or 5 in the data transmission period where the DRS is transmitted. This application addresses the issues of how LAA DRS and PDSCH can be multiplexed and transmitted / received during a data transmission period, as well as PDSCH rate matching.

Description

[0001] This application is a divisional application of application number 201510623692.X, entitled "Method and apparatus for transmitting and receiving multiplexed signals and physical downlink shared channels". Technical Field

[0002] This invention relates to the field of wireless communication, and more specifically, to a method and corresponding apparatus for discovering signals and transmitting and receiving physical downlink shared channels. Background Technology

[0003] LTE-U (Long Term Evolution – Unlicensed) refers to deploying LTE on unlicensed carriers to meet the growing capacity demands of wireless communication systems and improve the efficiency of unlicensed spectrum utilization. It represents a significant evolutionary direction for LTE and future wireless communication. When designing LTE-U, it's crucial to consider how to ensure fair and amicable competition for unlicensed carriers with other systems like WiFi (Wireless Fidelity) and radar, as well as with other LTE-U systems, while minimizing and preserving the core characteristics of LTE technology. According to 3GPP standards meetings, LTE-U systems can also be referred to as LAA (LTE Licensed Assisted Access) systems.

[0004] For communication systems using unlicensed carriers, it is necessary to avoid using unlicensed carriers that are already in use by existing sites, otherwise it will cause interference between systems. Therefore, in some countries (such as Europe and Japan), LBT (Listen before Talk) functionality is mandatory for unlicensed carriers. Before using an unlicensed carrier, a CCA (clear channel assessment) function must be performed. If it is found that a device is using the unlicensed carrier, or the detected signal strength exceeds the CCA threshold, access is delayed. If the channel is found to be idle, or the detected signal strength is below the CCA threshold, the unlicensed carrier is occupied.

[0005] The use of unlicensed carriers also requires addressing issues such as cell discovery, synchronization, and RRM (Radio Resource Management) measurements. The Discovery Reference Signal (DRS) specified in 3GPP Rel-12 can serve as a research reference. Currently, the pattern design of LAA DRS is mainly based on Rel-12 DRS, and then considers some characteristics of unlicensed carriers, such as time-domain continuity, frequency-domain bandwidth occupancy rules, and measurement accuracy, which will not be elaborated here.

[0006] Currently, there are no solutions proposed for how to multiplex LAA DRS and PDSCH during transmission, or how to receive data when LAA DRS and PDSCH are multiplexed during transmission. If not properly addressed, this will not only affect the transmission and reception of LAA DRS, but also the rate matching of PDSCH, leading to data reception errors. Summary of the Invention

[0007] In view of the above, the present invention provides the following technical solution.

[0008] A method for discovering signal and Physical Downlink Shared Channel (PDSCH) multiplexing transmissions, applied to a base station, the method comprising:

[0009] Within the data transmission time period, determine the subframe in the data transmission time period in which the Discovery Signal (DRS) is transmitted;

[0010] The PDSCH may be multiplexed on the subframes in which the DRS is transmitted during the data transmission period, or the PDSCH may be multiplexed only on subframes 0 and / or 5 in which the DRS is transmitted during the data transmission period.

[0011] Optionally,

[0012] Subframes within the data transmission period that satisfy one of the following conditions, or condition two, or both conditions one and two, or condition three, are determined as subframes for transmitting DRS:

[0013] Condition 1: The subframe is subframe 0 and / or subframe 5;

[0014] Condition 2: This subframe is a DRS candidate subframe;

[0015] Condition 3: The subframe is a DRS candidate subframe, and according to the DRS transmission strategy, the subframe should transmit DRS.

[0016] Optionally,

[0017] The DRS transmission strategy includes: transmitting DRS on DRS candidate subframes that meet one or more of the following conditions during the data transmission time period:

[0018] This DRS candidate subframe is a DRS fixed transmission subframe configured by the system;

[0019] The time elapsed from the previous DRS transmission subframe to this DRS candidate subframe exceeds the set time threshold.

[0020] The DRS candidate subframe is the first DRS candidate subframe of the data transmission time period, and its distance from the start position of the data transmission time period exceeds the set duration threshold.

[0021] The DRS candidate subframe is the i-th DRS candidate subframe in the data transmission time period, where i takes the value of 1, 2, ..., I, and I is the number of DRS candidate subframes in the data transmission time period.

[0022] The DRS candidate subframe is the DRS candidate subframe in the first DRS candidate subframe cluster during the data transmission time period.

[0023] Optionally,

[0024] The multiplexing of PDSCH transmission on subframes includes:

[0025] Map the PDSCH to symbols in the subframe other than those transmitting DRS; and / or

[0026] Map the PDSCH to the resource elements in the symbols of the DRS transmitted in the subframe, excluding the resource elements corresponding to the DRS pattern.

[0027] Optionally,

[0028] The method further includes:

[0029] When DRS is transmitted separately on a subframe, the DRS pattern used in that subframe adopts one of the first pattern or the first set of patterns.

[0030] When multiplexing PDSCH in a subframe, the DRS pattern used in that subframe adopts one of the second pattern or the second set of patterns.

[0031] Wherein, the second pattern may be the same as or different from the first pattern, and the second set of patterns may be the same as or different from the first set of patterns.

[0032] Optionally,

[0033] The pattern in the first pattern or the first group of patterns includes DRS and fill information;

[0034] When the second pattern differs from the first pattern, the second pattern includes DRS but does not include fill information; when the second set of patterns differs from the first set of patterns, the patterns in the second set of patterns include DRS but do not include fill information.

[0035] The filling information is information other than PDSCH and DRS, which is filled in to meet the requirements of time domain continuity and / or bandwidth usage.

[0036] Optionally,

[0037] The method further includes:

[0038] DRS configuration information and / or DRS transmission information for the data transmission period are sent to the terminal through one or more of downlink control signaling, downlink control channel and broadcast information.

[0039] Optionally,

[0040] The DRS configuration information includes one or more of the following:

[0041] Information on whether the DRS pattern used when sending DRS separately is the same as the DRS pattern used when sending DRS and multiplexing PDSCH;

[0042] Information from the DRS diagram;

[0043] Information about the port that sends the DRS component signal;

[0044] Information composed of DRS signals;

[0045] The DRS transmission information during the data transmission period includes one or more of the following:

[0046] Whether to send DRS information during the data transmission time period;

[0047] The location information of the subframes for transmitting DRS during the data transmission time period.

[0048] A method for receiving the Physical Downlink Shared Channel (PDSCH) during a data transmission period, applied to a terminal, includes:

[0049] When receiving data during a data transmission period, the first subframe in the data transmission period is determined; the first subframe refers to the subframe on which PDSCH is transmitted and PDSCH can only be mapped to resource elements other than the resource elements corresponding to the DRS pattern of the first subframe.

[0050] Receive PDSCH on the first subframe.

[0051] Optionally,

[0052] Determining the first subframe within the data transmission time period includes:

[0053] Based on the first agreement between the terminal and the base station and / or the first indication information sent by the base station, a second subframe in the data transmission time period is determined; the second subframe refers to a subframe in which the resource element corresponding to the DRS pattern has been occupied by information other than PDSCH or no information is being transmitted.

[0054] Based on the second agreement between the terminal and the base station and / or the second indication information sent by the base station, it is determined whether PDSCH is multiplexed in the second subframe. If so, the second subframe is the first subframe in the data transmission time period.

[0055] Optionally,

[0056] The first agreement includes:

[0057] If a subframe within the data transmission time period satisfies one of the following conditions, or two of the following conditions, or both of the following conditions, or three of the following conditions, then that subframe is the second subframe:

[0058] Condition 1: The subframe is subframe 0 and / or subframe 5;

[0059] Condition 2: This subframe is a DRS candidate subframe;

[0060] Condition 3: The subframe is a DRS candidate subframe, and according to the DRS transmission strategy, the subframe should transmit DRS.

[0061] Optionally,

[0062] The second agreement includes:

[0063] Multiplex the PDSCH transmission on the second subframe during the data transmission period; or

[0064] PDSCH is multiplexed and transmitted only on subframes 0 and / or 5 when subframe 0 and / or subframe 5 is the second subframe during the data transmission period.

[0065] Optionally,

[0066] The first subframe DRS pattern is determined based on the third agreement between the terminal and the base station and / or the third indication information sent by the base station;

[0067] The third agreement includes:

[0068] When the first information is transmitted separately in a subframe, the DRS pattern used in that subframe is either the first pattern or one of the first set of patterns;

[0069] When multiplexing the first information and PDSCH in a subframe, the DRS pattern used in that subframe is a second pattern or one of the second set of patterns;

[0070] Wherein, the second pattern may be the same as or different from the first pattern, and the second set of patterns may be the same as or different from the first set of patterns.

[0071] Optionally,

[0072] The pattern in the first pattern or the first group of patterns includes DRS and fill information;

[0073] When the second pattern differs from the first pattern, the second pattern includes DRS but does not include fill information; when the second set of patterns differs from the first set of patterns, the patterns in the second set of patterns include DRS but do not include fill information.

[0074] The filling information is information other than PDSCH and DRS, which is filled in to meet the requirements of time domain continuity and / or bandwidth usage.

[0075] Optionally,

[0076] The method further includes:

[0077] Obtain one or more of the following information from one or more of downlink control signaling, downlink control channel, and broadcast information:

[0078] The first indication information is used to indicate the second subframe within the data transmission time period;

[0079] The second indication information is used to indicate whether to multiplex the transmission of PDSCH on the second subframe;

[0080] The third indication information is used to indicate the DRS pattern used on the first subframe.

[0081] Optionally,

[0082] The second subframe refers to the subframe in which DRS is transmitted.

[0083] A base station, comprising:

[0084] The determination module is used to determine, within the data transmission time period, the subframe in which the discovery signal DRS is transmitted during the data transmission time period;

[0085] The multiplexing module is used to multiplex the transmission of PDSCH on the subframes in which DRS is transmitted during the data transmission time period, or to multiplex the transmission of PDSCH only on subframes 0 and / or 5 in which DRS is transmitted during the data transmission time period.

[0086] Optionally,

[0087] The determining module identifies subframes within the data transmission time period that satisfy one of the following conditions, or two of the following conditions, or both of the following conditions, or three of the following conditions, as subframes for transmitting DRS:

[0088] Condition 1: The subframe is subframe 0 and / or subframe 5;

[0089] Condition 2: This subframe is a DRS candidate subframe;

[0090] Condition 3: The subframe is a DRS candidate subframe, and according to the DRS transmission strategy, the subframe should transmit DRS.

[0091] Optionally,

[0092] The DRS transmission strategy includes: transmitting DRS on DRS candidate subframes that meet one or more of the following conditions during the data transmission time period:

[0093] This DRS candidate subframe is a DRS fixed transmission subframe configured by the system;

[0094] The time elapsed from the previous DRS transmission subframe to this DRS candidate subframe exceeds the set time threshold.

[0095] The DRS candidate subframe is the first DRS candidate subframe of the data transmission time period, and its distance from the start position of the data transmission time period exceeds the set duration threshold.

[0096] The DRS candidate subframe is the i-th DRS candidate subframe in the data transmission time period, where i takes the value of 1, 2, ..., I, and I is the number of DRS candidate subframes in the data transmission time period.

[0097] The DRS candidate subframe is the DRS candidate subframe in the first DRS candidate subframe cluster during the data transmission time period.

[0098] Optionally,

[0099] The multiplexing module multiplexes the transmitted PDSCH on the subframe, including:

[0100] Map the PDSCH to symbols in the subframe other than those transmitting DRS; and / or

[0101] Map the PDSCH to the resource elements in the symbols of the DRS transmitted in the subframe, excluding the resource elements corresponding to the DRS pattern.

[0102] Optionally,

[0103] The base station also includes:

[0104] The pattern setting module is used to set the DRS pattern used in a subframe to a first pattern or a first group of patterns when transmitting DRS independently in a subframe; and to set the DRS pattern used in a subframe to a second pattern or a second group of patterns when transmitting PDSCH multiplexed in a subframe; wherein the second pattern is the same as or different from the first pattern, and the second group of patterns is the same as or different from the first group of patterns.

[0105] Optionally,

[0106] The pattern in the first pattern or the first group of patterns includes DRS and fill information;

[0107] When the second pattern differs from the first pattern, the second pattern includes DRS but does not include fill information; when the second set of patterns differs from the first set of patterns, the patterns in the second set of patterns include DRS but do not include fill information.

[0108] The filling information is information other than PDSCH and DRS, which is filled in to meet the requirements of time domain continuity and / or bandwidth usage.

[0109] Optionally,

[0110] The base station also includes:

[0111] The information sending module is used to send DRS configuration information and / or DRS sending information for the data sending time period to the terminal through one or more of downlink control signaling, downlink control channel and broadcast information.

[0112] Optionally,

[0113] The DRS configuration information sent by the information sending module includes one or more of the following:

[0114] Information on whether the DRS pattern used when sending DRS separately is the same as the DRS pattern used when sending DRS and multiplexing PDSCH;

[0115] Information from the DRS diagram;

[0116] Information about the port that sends the DRS component signal;

[0117] Information composed of DRS signals;

[0118] The DRS transmission information for the data transmission time period sent by the information sending module includes one or more of the following:

[0119] Whether to send DRS information during the data transmission time period;

[0120] The location information of the subframes for transmitting DRS during the data transmission time period.

[0121] A terminal, comprising:

[0122] The determination module is used to determine the first subframe in the data transmission time period when receiving data during the data transmission time period; the first subframe refers to the subframe in which PDSCH is transmitted and PDSCH can only be mapped to resource elements other than the resource elements corresponding to the DRS pattern of the first subframe.

[0123] The receiving module is used to receive PDSCH on the first subframe.

[0124] Optionally,

[0125] The determining module determines the first subframe in the data transmission time period, including:

[0126] Based on the first agreement between the terminal and the base station and / or the first indication information sent by the base station, a second subframe in the data transmission time period is determined; the second subframe refers to a subframe in which the resource element corresponding to the DRS pattern has been occupied by information other than PDSCH or no information is being transmitted.

[0127] Based on the second agreement between the terminal and the base station and / or the second indication information sent by the base station, it is determined whether PDSCH is multiplexed in the second subframe. If so, the second subframe is the first subframe in the data transmission time period.

[0128] Optionally,

[0129] The first agreement includes:

[0130] If a subframe within the data transmission time period satisfies one of the following conditions, or two of the following conditions, or both of the following conditions, or three of the following conditions, then that subframe is the second subframe:

[0131] Condition 1: The subframe is subframe 0 and / or subframe 5;

[0132] Condition 2: This subframe is a DRS candidate subframe;

[0133] Condition 3: The subframe is a DRS candidate subframe, and according to the DRS transmission strategy, the subframe should transmit DRS.

[0134] Optionally,

[0135] The second agreement includes:

[0136] Multiplex the PDSCH transmission on the second subframe during the data transmission period; or

[0137] PDSCH is multiplexed and transmitted only on subframes 0 and / or 5 when subframe 0 and / or subframe 5 is the second subframe during the data transmission period.

[0138] Optionally,

[0139] The terminal also includes:

[0140] The DRS pattern determination module is used to determine the DRS pattern of the first subframe based on the third agreement between the terminal and the base station and / or the third indication information sent by the base station.

[0141] The third agreement includes:

[0142] When the first information is transmitted separately in a subframe, the DRS pattern used in that subframe is either the first pattern or one of the first set of patterns;

[0143] When multiplexing the first information and PDSCH in a subframe, the DRS pattern used in that subframe is a second pattern or one of the second set of patterns;

[0144] Wherein, the second pattern may be the same as or different from the first pattern, and the second set of patterns may be the same as or different from the first set of patterns.

[0145] Optionally,

[0146] The pattern in the first pattern or the first group of patterns includes DRS and fill information;

[0147] When the second pattern differs from the first pattern, the second pattern includes DRS but does not include fill information; when the second set of patterns differs from the first set of patterns, the patterns in the second set of patterns include DRS but do not include fill information.

[0148] The filling information is information other than PDSCH and DRS, which is filled in to meet the requirements of time domain continuity and / or bandwidth usage.

[0149] Optionally,

[0150] The terminal also includes:

[0151] The information receiving module is used to obtain one or more of the following information from one or more of downlink control signaling, downlink control channel, and broadcast information:

[0152] The first indication information is used to indicate the second subframe within the data transmission time period;

[0153] The second indication information is used to indicate whether to multiplex the transmission of PDSCH on the second subframe;

[0154] The third indication information is used to indicate the DRS pattern used on the first subframe.

[0155] Optionally,

[0156] The second subframe refers to the subframe in which DRS is transmitted.

[0157] The above-mentioned method and corresponding equipment for multiplexing transmission and reception of LAA DRS and PDSCH solve the problems of how LAA DRS and PDSCH can multiplex transmission and reception during data transmission time periods and PDSCH rate matching. Attached Figure Description

[0158] Figure 1 This is a flowchart of the method in Embodiment 1 of the present invention;

[0159] Figure 2 This is a block diagram of a base station according to Embodiment 1 of the present invention;

[0160] Figure 3 This is a flowchart of the method in Embodiment 2 of the present invention;

[0161] Figure 4 This is a module diagram of the terminal according to Embodiment 2 of the present invention;

[0162] Figure 5 This is a schematic diagram of the DRS pattern for Rel12. Detailed Implementation

[0163] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

[0164] Example 1

[0165] This embodiment provides a method for discovering signals and transmitting Physical Downlink Shared Channel (PDSCH), applicable to base stations such as those in LAA systems. Figure 1 As shown, the method includes:

[0166] Step 110: In the data transmission time period, determine the subframes in the data transmission time period for transmitting DRS;

[0167] Unless otherwise specified in the text, DRS refers to LAA DRS.

[0168] In this embodiment, subframes that satisfy one of the following conditions during the data transmission time period, or condition two, or conditions one and two, or condition three, are determined as subframes for transmitting DRS:

[0169] Condition 1: The subframe is subframe 0 and / or subframe 5;

[0170] Condition 2: This subframe is a DRS candidate subframe;

[0171] Condition 3: The subframe is a DRS candidate subframe, and according to the DRS transmission strategy, the subframe should transmit DRS.

[0172] The time period for candidate DRS transmission is generally called the DRS candidate time point, which can be greater than, less than, or equal to one subframe. In this paper, when the DRS candidate time point is equal to one subframe, the DRS candidate subframe is the DRS candidate time point; when the DRS candidate time point is less than one subframe, the DRS candidate subframe refers to the subframe containing the DRS candidate time point; when the DRS candidate time point is greater than one subframe, each subframe contained in the DRS candidate time point is a DRS candidate subframe.

[0173] The DRS transmission strategy includes transmitting DRS on DRS candidate subframes that meet one or more of the following conditions during the data transmission time period:

[0174] This DRS candidate subframe is a DRS fixed transmission subframe configured by the system;

[0175] The time elapsed from the previous DRS transmission subframe to this DRS candidate subframe exceeds the set time threshold.

[0176] The DRS candidate subframe is the first DRS candidate subframe of the data transmission time period, and its distance from the start position of the data transmission time period exceeds the set duration threshold.

[0177] The DRS candidate subframe is the i-th DRS candidate subframe in the data transmission time period, where i takes the value of 1, 2, ..., I, and I is the number of DRS candidate subframes in the data transmission time period.

[0178] The DRS candidate subframe is the DRS candidate subframe in the first DRS candidate subframe cluster during the data transmission time period.

[0179] Step 120: Multiplex the PDSCH on the subframes in which DRS is transmitted during the data transmission period, or multiplex the PDSCH only on subframes 0 and / or 5 in which DRS is transmitted during the data transmission period.

[0180] Subframes that do not send DRS will normally send PDSCH. In this document, "sending PDSCH", "receiving PDSCH" or similar expressions refer to the downlink data sent by the base station to the terminal on the PDSCH, which is abbreviated as "PDSCH" in accordance with the conventions of this field.

[0181] In this step, the PDSCH is multiplexed and transmitted on the previous frame, including:

[0182] Map the PDSCH to symbols in the subframe other than those transmitting DRS; and / or

[0183] Map the PDSCH to the resource elements in the symbols of the DRS transmitted in the subframe, excluding the resource elements corresponding to the DRS pattern.

[0184] For example, if the DRS time point uses all symbols in the subframe, when multiplexing the PDSCH, the PDSCH can be mapped to resource elements in all symbols of that subframe except for the resource elements corresponding to the DRS pattern. However, if the DRS time point only occupies a portion of the symbols in the subframe, such as symbols in a single time slot, when multiplexing the PDSCH in that subframe, the PDSCH can be mapped to symbols in that subframe that do not transmit DRS, and to resource elements in the symbols that transmit DRS except for the resource elements corresponding to the DRS pattern. It is easy to understand that the multiplexing of PDSCH in a subframe, as described in this paper, is predicated on the existence of scheduled PDSCH in that subframe.

[0185] In this embodiment,

[0186] When a base station transmits DRS separately in a subframe (without multiplexing PDSCH transmission), the DRS pattern used in that subframe adopts one of the first pattern or the first group of patterns.

[0187] When a base station multiplexes and transmits PDSCH on a subframe, the DRS pattern used in that subframe adopts one of the second pattern or a second set of patterns.

[0188] The second pattern may be the same as or different from the first pattern, and the second set of patterns may be the same as or different from the first set of patterns.

[0189] in,

[0190] When the second pattern differs from the first pattern, the second pattern includes DRS but does not include fill information; when the second set of patterns differs from the first set of patterns, the patterns in the second set of patterns include DRS but do not include fill information.

[0191] The padding information is information other than PDSCH and DRS, which is filled in to meet the requirements of time domain continuity and / or bandwidth usage.

[0192] In this embodiment,

[0193] The base station can send DRS configuration information and / or DRS transmission information for the data transmission period to the terminal through one or more of downlink control signaling (such as downlink control information DCI signaling), downlink control channel and broadcast information.

[0194] in,

[0195] The DRS configuration information includes one or more of the following:

[0196] Information on whether the DRS pattern used when sending DRS separately is the same as the DRS pattern used when sending DRS and multiplexing PDSCH;

[0197] Information from the DRS diagram;

[0198] Information about the port that sends the DRS component signal;

[0199] Information composed of DRS signals;

[0200] The DRS transmission information during the data transmission period includes one or more of the following:

[0201] Whether to send DRS information during the data transmission time period;

[0202] The location information of the subframes for transmitting DRS during the data transmission time period.

[0203] This embodiment also provides a base station, such as Figure 2 As shown, it includes:

[0204] The determining module 10 is used to determine, within the data transmission time period, the subframe in which the discovery signal DRS is transmitted during the data transmission time period;

[0205] The multiplexing module 20 is used to multiplex the transmission of PDSCH on the subframes in which DRS is transmitted during the data transmission time period, or to multiplex the transmission of PDSCH only on subframes 0 and / or 5 in which DRS is transmitted during the data transmission time period.

[0206] Optionally,

[0207] The determining module identifies subframes within the data transmission time period that satisfy one of the following conditions, or two of the following conditions, or both of the following conditions, or three of the following conditions, as subframes for transmitting DRS:

[0208] Condition 1: The subframe is subframe 0 and / or subframe 5;

[0209] Condition 2: This subframe is a DRS candidate subframe;

[0210] Condition 3: The subframe is a DRS candidate subframe, and according to the DRS transmission strategy, the subframe should transmit DRS.

[0211] Optionally,

[0212] The DRS transmission strategy includes: transmitting DRS on DRS candidate subframes that meet one or more of the following conditions during the data transmission time period:

[0213] This DRS candidate subframe is a DRS fixed transmission subframe configured by the system;

[0214] The time elapsed from the previous DRS transmission subframe to this DRS candidate subframe exceeds the set time threshold.

[0215] The DRS candidate subframe is the first DRS candidate subframe of the data transmission time period, and its distance from the start position of the data transmission time period exceeds the set duration threshold.

[0216] The DRS candidate subframe is the i-th DRS candidate subframe in the data transmission time period, where i takes the value of 1, 2, ..., I, and I is the number of DRS candidate subframes in the data transmission time period.

[0217] The DRS candidate subframe is the DRS candidate subframe in the first DRS candidate subframe cluster during the data transmission time period.

[0218] Optionally,

[0219] The multiplexing module multiplexes the transmitted PDSCH on the subframe, including:

[0220] Map the PDSCH to symbols in the subframe other than those transmitting DRS; and / or

[0221] Map the PDSCH to the resource elements in the symbols of the DRS transmitted in the subframe, excluding the resource elements corresponding to the DRS pattern.

[0222] Optionally,

[0223] The base station also includes:

[0224] The pattern setting module is used to set the DRS pattern used in a subframe to a first pattern or a first group of patterns when transmitting DRS independently in a subframe; and to set the DRS pattern used in a subframe to a second pattern or a second group of patterns when transmitting PDSCH multiplexed in a subframe; wherein the second pattern is the same as or different from the first pattern, and the second group of patterns is the same as or different from the first group of patterns.

[0225] Optionally,

[0226] The pattern in the first pattern or the first group of patterns includes DRS and fill information;

[0227] When the second pattern differs from the first pattern, the second pattern includes DRS but does not include fill information; when the second set of patterns differs from the first set of patterns, the patterns in the second set of patterns include DRS but do not include fill information.

[0228] The filling information is information other than PDSCH and DRS, which is filled in to meet the requirements of time domain continuity and / or bandwidth usage.

[0229] Optionally,

[0230] The base station also includes:

[0231] The information sending module is used to send DRS configuration information and / or DRS sending information for the data sending time period to the terminal through one or more of downlink control signaling, downlink control channel and broadcast information.

[0232] Optionally,

[0233] The DRS configuration information sent by the information sending module includes one or more of the following:

[0234] Information on whether the DRS pattern used when sending DRS separately is the same as the DRS pattern used when sending DRS and multiplexing PDSCH;

[0235] Information from the DRS diagram;

[0236] Information about the port that sends the DRS component signal;

[0237] Information composed of DRS signals;

[0238] The DRS transmission information for the data transmission time period sent by the information sending module includes one or more of the following:

[0239] Whether to send DRS information during the data transmission time period;

[0240] The location information of the subframes for transmitting DRS during the data transmission time period.

[0241] Example 2

[0242] This embodiment provides a method for receiving PDSCH during a data transmission period, applied to a terminal, such as... Figure 3 As shown, it includes:

[0243] Step 210: When receiving data during the data transmission period, determine the first subframe in the data transmission period; the first subframe refers to the subframe on which PDSCH is transmitted and PDSCH can only be mapped to resource elements other than the resource elements corresponding to the DRS pattern of the first subframe.

[0244] PDSCH can only be mapped to resource elements other than the resource element corresponding to the DRS pattern of the first subframe. That is, PDSCH on the first subframe cannot be mapped to the resource element corresponding to the DRS pattern of the first subframe.

[0245] In this embodiment, determining the first subframe within the data transmission time period includes:

[0246] Based on the first agreement between the terminal and the base station and / or the first indication information sent by the base station, a second subframe in the data transmission time period is determined; the second subframe refers to a subframe in which the resource element corresponding to the DRS pattern has been occupied by information other than PDSCH or no information is being transmitted.

[0247] Based on the second agreement between the terminal and the base station and / or the second indication information sent by the base station, it is determined whether PDSCH is multiplexed in the second subframe. If so, the second subframe is the first subframe in the data transmission time period.

[0248] The aforementioned second subframe can be a subframe for transmitting DRS. However, it should be noted that, depending on actual needs, the base station may also transmit other information besides DRS on the resource element corresponding to DRS in the DRS pattern, and this invention does not limit this. The terminal can avoid erroneous reception of PDSCH by determining that the resource element corresponding to DRS in the DRS pattern will not be mapped.

[0249] in,

[0250] The first agreement includes: if a subframe in the data transmission time period satisfies one of the following conditions, or condition two, or conditions one and two, or condition three, then the subframe is the second subframe:

[0251] Condition 1: The subframe is subframe 0 and / or subframe 5;

[0252] Condition 2: This subframe is a DRS candidate subframe;

[0253] Condition 3: The subframe is a DRS candidate subframe, and according to the DRS transmission strategy, the subframe should transmit DRS.

[0254] The second agreement includes:

[0255] Multiplex the PDSCH transmission on the second subframe during the data transmission period; or

[0256] PDSCH is multiplexed and transmitted only on subframes 0 and / or 5 when subframe 0 and / or subframe 5 is the second subframe during the data transmission period.

[0257] In this embodiment, the first subframe DRS pattern is determined based on the third agreement between the terminal and the base station and / or the third indication information sent by the base station;

[0258] The third agreement includes:

[0259] When the first information is transmitted separately in a subframe, the DRS pattern used in that subframe is either the first pattern or one of the first set of patterns;

[0260] When multiplexing the first information and PDSCH in a subframe, the DRS pattern used in that subframe is a second pattern or one of the second set of patterns;

[0261] The second pattern may be the same as or different from the first pattern, and the second set of patterns may be the same as or different from the first set of patterns.

[0262] In one example

[0263] The pattern in the first pattern or the first group of patterns includes DRS and fill information;

[0264] When the second pattern differs from the first pattern, the second pattern includes DRS but does not include fill information; when the second set of patterns differs from the first set of patterns, the patterns in the second set of patterns include DRS but do not include fill information.

[0265] The filling information is information other than PDSCH and DRS, which is filled in to meet the requirements of time domain continuity and / or bandwidth usage.

[0266] It should be noted that the DRS in the above DRS drawing does not include fill information, but all information in the DRS drawing can also be referred to as DRS.

[0267] Step 220: Receive PDSCH on the first subframe.

[0268] When it is known that the PDSCH on the first subframe cannot be mapped to the resource element corresponding to the DRS pattern of the first subframe, when performing rate matching on the PDSCH received on the first subframe, the data on the resource element corresponding to the DRS pattern of the first subframe can be removed, and other processing methods to ensure correct PDSCH reception can be adopted.

[0269] The method in this embodiment may also include:

[0270] The terminal obtains one or more of the following information from downlink control signaling, downlink control channel, and broadcast information:

[0271] The first indication information is used to indicate the second subframe within the data transmission time period;

[0272] The second indication information is used to indicate whether to multiplex the transmission of PDSCH on the second subframe;

[0273] The third indication information is used to indicate the DRS pattern used on the first subframe.

[0274] This embodiment also provides a terminal, such as Figure 4 As shown, it includes:

[0275] The determining module 50 is used to determine the first subframe in the data transmission time period when receiving data during the data transmission time period; the first subframe refers to the subframe in which PDSCH is transmitted and PDSCH can only be mapped to resource elements other than the resource elements corresponding to the DRS pattern of the first subframe.

[0276] The receiving module 60 is used to receive PDSCH on the first subframe.

[0277] Optionally,

[0278] The determining module determines the first subframe in the data transmission time period, including:

[0279] Based on the first agreement between the terminal and the base station and / or the first indication information sent by the base station, a second subframe in the data transmission time period is determined; the second subframe refers to a subframe in which the resource element corresponding to the DRS pattern has been occupied by information other than PDSCH or no information is being transmitted.

[0280] Based on the second agreement between the terminal and the base station and / or the second indication information sent by the base station, it is determined whether PDSCH is multiplexed in the second subframe. If so, the second subframe is the first subframe in the data transmission time period.

[0281] Optionally,

[0282] The first agreement includes:

[0283] If a subframe within the data transmission time period satisfies one of the following conditions, or two of the following conditions, or both of the following conditions, or three of the following conditions, then that subframe is the second subframe:

[0284] Condition 1: The subframe is subframe 0 and / or subframe 5;

[0285] Condition 2: This subframe is a DRS candidate subframe;

[0286] Condition 3: The subframe is a DRS candidate subframe, and according to the DRS transmission strategy, the subframe should transmit DRS.

[0287] Optionally,

[0288] The second agreement includes:

[0289] Multiplex the PDSCH transmission on the second subframe during the data transmission period; or

[0290] PDSCH is multiplexed and transmitted only on subframes 0 and / or 5 when subframe 0 and / or subframe 5 is the second subframe during the data transmission period.

[0291] Optionally,

[0292] The terminal also includes:

[0293] The DRS pattern determination module is used to determine the DRS pattern of the first subframe based on the third agreement between the terminal and the base station and / or the third indication information sent by the base station.

[0294] The third agreement includes:

[0295] When the first information is transmitted separately in a subframe, the DRS pattern used in that subframe is either the first pattern or one of the first set of patterns;

[0296] When multiplexing the first information and PDSCH in a subframe, the DRS pattern used in that subframe is a second pattern or one of the second set of patterns;

[0297] Wherein, the second pattern may be the same as or different from the first pattern, and the second set of patterns may be the same as or different from the first set of patterns.

[0298] Optionally,

[0299] The pattern in the first pattern or the first group of patterns includes DRS and fill information;

[0300] When the second pattern differs from the first pattern, the second pattern includes DRS but does not include fill information; when the second set of patterns differs from the first set of patterns, the patterns in the second set of patterns include DRS but do not include fill information.

[0301] The filling information is information other than PDSCH and DRS, which is filled in to meet the requirements of time domain continuity and / or bandwidth usage.

[0302] Optionally,

[0303] The terminal also includes:

[0304] The information receiving module is used to obtain one or more of the following information from one or more of downlink control signaling, downlink control channel, and broadcast information:

[0305] The first indication information is used to indicate the second subframe within the data transmission time period;

[0306] The second indication information is used to indicate whether to multiplex the transmission of PDSCH on the second subframe;

[0307] The third indication information is used to indicate the DRS pattern used on the first subframe.

[0308] Optionally,

[0309] The second subframe refers to the subframe in which DRS is transmitted.

[0310] Example 3

[0311] This embodiment relates to a method for determining the DRS time point (or time position) for LAA DRS transmission based on LBT in the LAA system. There are two main methods:

[0312] Method A1: Similar to Rel-12DRS, based on LBT, within a configured DMTC (DRS measurement timing configuration), LAA DRS is only allowed to be transmitted at a fixed DRS time point. In one example, the LAA DRS DMTC period is 40ms, with subframes 0, 40, 80, etc., representing a fixed DRS time point within each DMTC. It is assumed here that each DRS time point is one subframe. The specific location and size of the DRS time points depend on the design of the DRS time-frequency pattern and the transmission method; this is only an example. Each DRS occasion is 1ms long.

[0313] If LBT fails to execute before or at the fixed DRS time point in the configured DMTC, i.e., LAADRS transmission fails, then it is necessary to wait for the opportunity to transmit DRS at the fixed DRS time point in the next DMTC. This method results in fewer opportunities to transmit LAADRS; there is only one chance to transmit DRS in each DMTC. In heavy-load scenarios, there may be no opportunity to transmit for an extended period, thus affecting functions such as cell identification, synchronization, and RRM measurement between the LAA base station and the UE.

[0314] Method A2: Based on LBT, within a configured DMTC, LAA DRS is allowed to be transmitted at at least one of multiple different DRS time points.

[0315] Method A2 can increase the transmission opportunities of LAA DRS, thereby reducing the impact on functions such as cell identification, synchronization, and RRM measurement. Method A2 can be further divided into several methods:

[0316] Method A2-1: Multiple different DRS time points are distributed within a certain time period or time window of the configured DMTC, such as a period of time at the beginning of the DMTC. For example, the DMTC period is 40ms, and the length of each DRS occasion is 1ms. Subframes 0, 1, 2, ..., 4 can be used as different DRS time points in this DMTC. Subframes 40, 41, 42, ..., 44 can be used as different DRS time points in the next DMTC.

[0317] Method A2-2: Multiple different DRS time points are evenly or periodically distributed throughout the DMTC. For example, the DMTC period is 40ms, and each DRS occasion is 1ms long. Subframes 0, 10, 20, and 30 represent different DRS time points within this DMTC. Subframes 40, 50, 60, and 70 represent the DRS time points within the next DMTC.

[0318] Method A2-3: Multiple different DRS time points are distributed in clusters within or between configured DMTCs. Each cluster is equivalent to a time window, and each cluster contains multiple DRS time points, meaning there are several opportunities to send DRS within each cluster. Each DMTC can contain several clusters or time windows. Preferably, the clusters or time windows within a DMTC can be distributed periodically.

[0319] For example, assume a DMTC period of 40ms and a DRS occasion length of 1ms. Also assume each DMTC clock contains two clusters, each cluster containing 5 DRS time points. For example, subframes 0, 1, 2, ..., 4 represent different DRS time points in the first cluster of the DMTC. Subframes 20, 21, 22, ..., 24 represent different DRS time points in the second cluster of the DMTC. That is, the DMTC has two opportunity clusters or time windows for DRS transmission, each opportunity cluster containing 5 subframes, providing 5 possible opportunities to transmit DRS. Method A2-3 is more effective for DRS transmission by multiple base stations or multiple operators. One operator can compete for an opportunity cluster to provide to several subordinate base stations for DRS transmission, while another operator can compete for a different opportunity cluster.

[0320] Within each DMTC, or within each time window (or cluster) of a DMTC, when LBT is performed before or at the beginning of different DRS time points, a complete LBT procedure (including CCA and ECCA) does not need to be executed. A shortened LBT procedure can be executed, or the LBT procedure from the previous DRS time point can be continued. For example, in the example of method A2-1, the base station performs LBT (including CCA and ECCA) at the beginning of subframe 0 to prepare for sending DRS. When the random window length of LBT ECCA is N, and N counts down to N1, the available time for LBT to be performed at the corresponding DRS time point has been exhausted, meaning that the LBT execution for subframe 0 fails, and the DRS transmission in subframe 0 fails. The base station performs LBT again at the next DRS time point, that is, before or at the beginning of subframe 1. At this time, a complete CCA / ECCA procedure does not need to be executed; the countdown can continue from N1, that is, the LBT procedure from subframe 0 can be continued.

[0321] In addition, there are several other methods to send LAA DRS. One method is to send it via Short Control Signalling (SCS), which does not require LBT execution before sending the DRS. Another method is to send the DRS in an aperiodic manner. This method of sending LAA DRS at a time point that is not part of the DMTC rules can be called an out-of-DMTC DRS time point.

[0322] Example 4

[0323] This embodiment relates to the LBT method associated with DRS time points.

[0324] Whether to perform LBT before or at the beginning of each DRS time point within or outside the DMTC, or whether to attempt to send LAA DRS at each DRS time point, can be done in several ways:

[0325] Method B1: Before or at the beginning of each DRS time point, LBT is performed in the configured DMTC and / or outside the DMTC to attempt to send the DRS. Once LBT is successful, the DRS will be sent.

[0326] This method incurs high resource overhead, and the LBT (Local Bit-Based Transmission) and transmission of DRS can reduce the probability of data transmission competing for unlicensed carriers, especially in scenarios with heavy loads and densely distributed DRS time points. However, the transmission, cell synchronization, and measurement performance of DRS can be well guaranteed.

[0327] Method B2: Within and / or outside the configured DMTC, there exists a fixed DRS time point. LBT must be performed before or at the beginning of this fixed DRS time point; or, in other words, the base station will attempt to transmit a DRS at the fixed DRS time point. Whether LBT is performed or a DRS is transmitted before or at the beginning of other DRS time points within and / or outside the DMTC depends on whether a DRS was successfully transmitted at a previous DRS time point. This fixed DRS time point can exist periodically.

[0328] In other words, whether within or outside the configured DMTC, LBT will be executed before or at the beginning of a fixed DRS time point. If successful, a DRS will be sent. Then, it is not necessary to send a DRS at subsequent DRS time points within that DMTC (or at least not to execute LBT for sending a DRS). Instead, it will wait for LBT to be executed before or at the beginning of the fixed DRS time point in the next DMTC and attempt to send a DRS. If it fails, LBT will be executed before or at the beginning of a DRS time point after the fixed DRS time point. Once a DRS is successfully sent, it will wait for the fixed DRS time point in the next DMTC.

[0329] Method B3: If a DRS is successfully transmitted at a certain DRS time point, the next DRS time point requiring LBT to transmit a DRS will be the first DRS time point after adding a certain duration to the current DRS time point. This duration can be a DMTC period, such as 40ms, or other defined durations, such as 20ms. No DRS transmission attempts are needed between this DRS time point and the next DRS time point requiring LBT to transmit a DRS.

[0330] Method B3 can avoid sending DRS at two DRS time points that are too close together, thus avoiding the waste of unlicensed carrier resources.

[0331] Method B4: If the data transmission period includes a DRS time point (also known as a DRS candidate time point), whether DRS is transmitted at the DRS candidate time point depends on the multiplexing method of LAA DRS and PDSCH. For subframes 0 and / or 5 included in the data transmission period (subframes 0 and / or 5 may or may not be DRS candidate transmission subframes or candidate time points), it can also be determined whether to transmit DRS on subframes 0 and / or 5 based on the multiplexing method of LAA DRS and PDSCH.

[0332] For a base station to transmit data, it needs to perform a Level-Based Transmission (LBT) process. If the LBT is successful, it will have approximately 1ms to 10ms to transmit the data; this period can be called the data transmission time period. In other words, during the data transmission time period, the LBT performed for data transmission has already been successfully executed. Different processing strategies can be applied to DRS transmission points during the data transmission time period and DRS transmission points outside the data transmission time period.

[0333] The following example, A2-2, illustrates the application of methods B1-B4.

[0334] For method B1, an LBT (Launch By-Test) needs to be performed before or at the beginning of each DRS time point within and / or outside the DMTC (regardless of whether it is a fixed DRS time point or other candidate DRS time points) to attempt to send a DRS. For example, for the first DMTC in the example above, an LBT needs to be performed before or at the beginning of subframe 0 (fixed DRS time point), subframe 10, subframe 20, and subframe 30 to send a DRS. A successful LBT will result in the transmission of a DRS.

[0335] For method B2, LBT must be performed before / at a fixed DRS time point, such as subframe 0, subframe 40, subframe 80, etc. in the example above. If LBT succeeds, DRS is sent. If LBT fails, DRS is not sent.

[0336] Whether LBT is performed before or at the beginning of other DRS candidate time points within the DMTC depends on whether LBT was successful before or at the beginning of the DRS time point before that candidate time point.

[0337] If LBT is successfully performed before / at the beginning of subframe 0, DRS is transmitted in subframe 0. Therefore, LBT does not need to be performed before / at the beginning of subsequent candidate time points within this DMTC, meaning no attempt is made to transmit DRS. Instead, LBT is executed before / at the beginning of the fixed DRS time point subframe 40 in the next DMTC, and DRS transmission is attempted, and so on.

[0338] If LBT fails before / at the beginning of subframe 0, LBT is then performed before / at the beginning of candidate timeframe 10. If successful, DRS is transmitted. LBT is not required before / at the beginning of subsequent candidate timeframes within this DMTC; instead, LBT is performed directly before / at the beginning of the fixed DRS timeframe 40 within the next DMTC, attempting to transmit DRS. If this fails, LBT is performed before / at the beginning of subsequent candidate timeframes within this DMTC, such as before / at the beginning of subframe 20 and subframe 30, attempting to transmit DRS, and so on.

[0339] For method B3, assume the duration is 40ms. If the base station fails to perform LBT in subframe 0 and subframe 10 and does not send DRS, but successfully sends DRS in subframe 20, then the next DRS time point for performing LBT and sending DRS is subframe 60. DRS time points between subframe 20 and subframe 60, namely subframes 30, 40, and 50, do not need to attempt to send DRS.

[0340] The following uses several application methods to illustrate the multiplexing transmission and reception of LAA DRS and PDSCH.

[0341] When PDSCH is not transmitted, even if only traditional signals (such as CRS, and / or PSS / SSS, and / or CSI-RS) exist in the time domain of LAA DRS, Figure 5 The diagram of Rel-12 DRS is shown. However, when DRS is transmitted alone, the bandwidth occupied by PSS / SSS (only occupying the middle 6 or 7 RBs of the system bandwidth) does not meet the rule requirement (i.e., the occupied bandwidth must be greater than or equal to 80% of the nominal bandwidth). Therefore, when DRS is transmitted alone, the frequency domain of PSS / SSS (frequency domain resources outside the middle 6 / 7 RBs of the system bandwidth) needs to be filled with control information / broadcast information, or reference signal RS (such as PSS, or SSS, or CRS, or CSI-RS), or other information or new signals to meet the bandwidth occupation rule requirements.

[0342] In addition, due to the discontinuity in the time domain of Rel-12DRS symbols, LAA DRS may fill the discontinuous blank symbols in the Rel-12 DRS with control information / broadcast information, or reference signals RS (such as PSS, SSS, CRS, or CSI-RS), or other information or new signals to satisfy the time domain continuity; or, LAA DRS may directly extract the time-continuous symbols in Rel-12DRS as LAA DRS.

[0343] When LAA DRS and PDSCH are transmitted together, these control / broadcast messages, reference signal RS, or other information or signals may or may not be transmitted. The requirements for time domain continuity and bandwidth usage can be met by transmitting PDSCH.

[0344] LAA DRS and PDSCH being transmitted together means that the data transmission burst time period includes the DRS transmission subframe or DRS time point. The DRS transmission subframe or DRS time point can be located at the beginning, middle, or end of the data transmission burst.

[0345] Method C1

[0346] LAA DRS and PDSCH can be multiplexed and transmitted in the same subframe. However, the same subframe can only be subframe 0 and / or subframe 5; DRS and PDSCH cannot be multiplexed and transmitted in other subframes.

[0347] The advantages of this method are: the transmission patterns (PSS / SSS / CRS) of LAA DRS in subframes 0 / 5 may be the same as those in existing technologies in subframes 0 / 5, meaning they occupy the same REs in subframes 0 / 5. Existing technologies do not transmit PSS / SSS in other subframes, so the LAA DRS transmission patterns in other subframes must be different from those transmitted in existing technologies. Therefore, PDSCH and DRS can be multiplexed in subframes 0 / 5 but not in other subframes, reducing the difficulty of UE rate matching.

[0348] Method C1 can be applied in two specific scenarios:

[0349] Scene 1:

[0350] If the data transmission burst time period contains a DRS candidate time point (or a DRS candidate transmission subframe. The duration of a candidate time point can be greater than / equal to / less than one subframe. The candidate transmission subframes mentioned in this document are merely examples of candidate time points and do not represent a narrowing of the range of candidate time points. Candidate time points include the DRS time points defined by DMTC as described above, as well as DRS time points to be transmitted defined by other methods such as aperiodic or SCS. The context is the same.), the DRS candidate transmission subframe or candidate time point described in Scenario 1 is located in a subframe that is not subframe 0 / 5.

[0351] For scenario 1, the following reuse methods can be included.

[0352] Method C1-1-1:

[0353] PDSCH will not be mapped to the entire DRS candidate transmission subframe or candidate time point in subframes other than 0 / 5. That is, PDSCH will not be transmitted in the entire DRS candidate transmission subframe or candidate time point in subframes other than 0 / 5.

[0354] To avoid the channel being preempted during data transmission, DRS should be transmitted in the DRS candidate subframe or candidate time point regardless of whether it should be transmitted (in some scenarios, such as methods B2 / B3 above, DRS will only be attempted to be transmitted at certain DRS candidate time points if DRS transmission at previous candidate time points has failed).

[0355] The DRS time-frequency pattern (or signal composition) transmitted at this time may be the same as or different from the time-frequency pattern (or signal composition) when the DRS is transmitted alone. Preferably, the same time-frequency pattern or signal composition is used.

[0356] Regarding method C1-1-1, the UE will make at least one of the following assumptions or behaviors:

[0357] The UE needs to perform blind DRS detection in all DRS candidate transmission subframes.

[0358] The UE assumes that all DRS candidate transmission subframes located in non-0 / 5 subframes will not map PDSCH.

[0359] The UE assumes that the DRS candidate transmission subframe located in a non-0 / 5 subframe of the data transmission burst will transmit DRS.

[0360] The system receives downlink signaling or channels from the base station. These downlink signaling or channels notify the DRS whether to send and / or rate-matched patterns (or time-frequency patterns sent by the DRS). The downlink signaling or channels may include DCI (Downlink Control Information) signaling, PDCCH / EPDCCH, etc. If the DRS patterns are the same (preferably the same), DCI signaling may not be used to notify the DRS of the pattern information. Other examples follow the same principle.

[0361] Method C1-1-2:

[0362] PDSCH is transmitted normally in DRS candidate transmission subframes or candidate time points that are not 0 / 5 subframes, and DRS is not transmitted in DRS candidate transmission subframes that are not 0 / 5 subframes. That is, when PDSCH is transmitted in DRS candidate transmission subframes or candidate time points that are not 0 / 5 subframes, it can be mapped to the time-frequency resources corresponding to the DRS pattern.

[0363] Regarding method C1-1-2, the UE will make at least one of the following assumptions or behaviors:

[0364] The UE needs to perform blind DRS detection in all DRS candidate transmission subframes.

[0365] The UE assumes that the PDSCH is transmitted normally in the DRS candidate transmission subframes that are not 0 / 5 subframes, that is, it does not need to remove the resource elements corresponding to the DRS time-frequency pattern when the rate is matched.

[0366] The UE assumes that DRS candidate transmission subframes that are not 0 / 5 subframes in the data transmission burst will not transmit DRS.

[0367] The system receives downlink signaling or channels sent by the base station. These downlink signaling or channels are used to notify the DRS whether it sends and / or rate-matched patterns (or time-frequency patterns sent by the DRS). The downlink signaling or channels may include DCI signaling, PDCCH / EPDCCH, etc. If the DRS patterns are the same (preferably the same), DCI signaling may not be used to notify the DRS pattern information.

[0368] Method C1-1-3:

[0369] In DRS candidate transmission subframes or candidate time points that are not 0 / 5 subframes, DRS may or may not be transmitted, depending on factors such as the DRS transmission method and LBT results, as in methods B2 / B3. If DRS is successfully transmitted, PDSCH transmission cannot map to the candidate subframes or candidate time points of the non-0 / 5 subframes corresponding to the DRS. If DRS is not transmitted, PDSCH is transmitted normally in the DRS candidate transmission subframes or candidate time points of the non-0 / 5 subframes and can be mapped to the time-frequency resources corresponding to the DRS pattern.

[0370] This method determines whether to transmit DRS and / or DRS configuration information (such as time-frequency patterns and / or DRS time-frequency pattern types) in candidate DRS transmission subframes or candidate time points other than subframes 0 / 5. The eNB can notify the UE via downlink signaling or channel communication, such as through DCI signaling, which can be included in scheduling signaling. Other non-scheduled UEs can perform blind detection. Alternatively, the method can broadcast information such as whether DRS is transmitted and / or DRS configuration information (such as time-frequency patterns and / or DRS time-frequency pattern types).

[0371] In response to this method, the UE will make at least one of the following assumptions or behaviors:

[0372] The UE can perform blind DRS detection in all DRS candidate subframes. For example, a non-serving UE.

[0373] The UE receives downlink signaling or channels sent by the base station. The downlink signaling or channels are used to notify the DRS whether to send and / or rate-matched patterns (or time-frequency patterns sent by the DRS). The downlink signaling or channels may include DCI signaling, PDCCH / EPDCCH, etc.

[0374] The UE receives broadcast information to obtain information on whether a candidate time point or candidate transmission subframe transmits DRS, and / or rate matching patterns (or time-frequency patterns of DRS transmission).

[0375] The UE assumes that the DRS candidate transmission subframes that transmit non-0 / 5 subframes will not map the PDSCH. That is, the UE will obtain whether the DRS is transmitted and / or the DRS time-frequency pattern information based on the results of blind detection or receiving downlink signaling / channel / broadcast information, and punch holes in the RE occupied by the DRS.

[0376] Scene 2:

[0377] If the data transmission burst duration includes subframe 0 and / or subframe 5, subframe 0 and / or subframe 5 may or may not be DRS candidate transmission subframes. PDSCH can be multiplexed with DRS in subframe 0 and / or subframe 5, and PDSCH will not be mapped to the resource elements (REs) occupied by DRS in subframe 0 and / or subframe 5.

[0378] For scenario 2, the following reuse methods can be included.

[0379] Method C1-2-1:

[0380] Regardless of whether subframe 0 and / or subframe 5 are DRS candidate transmission subframes, the base station will transmit DRS in subframe 0 and / or subframe 5. PDSCH can be multiplexed with DRS in subframe 0 and / or subframe 5, and PDSCH will not be mapped to the resource element (RE) occupied by DRS in subframe 0 and / or subframe 5.

[0381] The DRS time-frequency pattern or signal composition transmitted multiplexed with PDSCH can be the same as or different from that transmitted separately. Method one is that the DRS always uses the same time-frequency pattern or signal composition, meaning the same time-frequency pattern is used for both separate and PDSCH-multiplexed transmissions. Method two is that when the DRS is transmitted separately, a predefined pattern 1 DRS is transmitted to meet time-domain continuity and bandwidth usage rules. When transmitted with PDSCH, control / broadcast information, new reference signals (RS), or other information or signals used to meet time-domain continuity and rule requirements are not transmitted; instead, a predefined pattern 2 DRS is transmitted. When transmitted with PDSCH, the DRS time-frequency pattern and signal composition are relatively fixed or the same, meaning the DRS time-frequency patterns transmitted in subframe 0 and / or subframe 5 are the same. Method three is that regardless of whether the DRS is transmitted separately or multiplexed with PDSCH, the DRS time-frequency pattern and signal composition may be different, or a limited range of DRS pattern types may be selected for transmission. Method two is preferred.

[0382] The base station can send downlink signaling or channels to notify the DRS whether to send and / or rate-matched patterns (or time-frequency patterns sent by the DRS). Downlink signaling or channels may include DCI signaling, PDCCH / EPDCCH, etc.

[0383] Regarding method C1-2-1, the UE will make at least one of the following assumptions or behaviors:

[0384] The UE needs to perform blind DRS detection in all DRS candidate transmission subframes;

[0385] The UE assumes that DRS will be transmitted in subframes 0 / 5 of the data transmission burst.

[0386] When matching UE rates, it will assume that PDSCH will not be mapped to the resource element RE occupied by DRS in subframe 0 and / or subframe 5.

[0387] The DRS time-frequency pattern or signal composition multiplexed with PDSCH may be the same as or different from that of DRS transmitted alone. However, for the UE, the DRS pattern of multiplexed transmission can be a known pattern, that is, the time-frequency pattern occupied by DRS in subframe 0 and / or subframe 5 is fixed.

[0388] Alternatively, the system receives downlink signaling or channels sent by the base station. These downlink signaling or channels are used to notify the DRS whether to send and / or rate-matched patterns (or time-frequency patterns sent by the DRS). The downlink signaling or channels may include DCI signaling, PDCCH / EPDCCH, etc.

[0389] Method C1-2-2

[0390] Assuming subframe 0 and / or subframe 5 are DRS candidate transmission subframes, the base station will transmit the DRS in subframe 0 and / or subframe 5. The PDSCH can be multiplexed with the DRS in subframe 0 and / or subframe 5, and the PDSCH will not be mapped to the resource element (RE) occupied by the DRS in subframe 0 and / or subframe 5.

[0391] The DRS time-frequency pattern or signal composition transmitted multiplexed with PDSCH can be the same as or different from that transmitted separately. Method one is that the DRS always uses the same time-frequency pattern or signal composition, meaning the same time-frequency pattern is used for both separate and PDSCH-multiplexed transmissions. Method two is that when the DRS is transmitted separately, a predefined pattern 1 DRS is transmitted to meet time-domain continuity and bandwidth usage rules. When transmitted with PDSCH, control / broadcast information, new reference signals (RS), or other information or signals used to meet time-domain continuity and rule requirements are not transmitted; instead, a predefined pattern 2 DRS is transmitted. When transmitted with PDSCH, the DRS time-frequency pattern and signal composition are relatively fixed or the same, meaning the DRS time-frequency patterns transmitted in subframe 0 and / or subframe 5 are the same. Method three is that regardless of whether the DRS is transmitted separately or multiplexed with PDSCH, the DRS time-frequency pattern and signal composition may be different, or a limited range of DRS pattern types may be selected for transmission. Method two is preferred.

[0392] The base station can send downlink signaling or channels to notify the DRS whether to send and / or rate-matched patterns (or time-frequency patterns sent by the DRS). Downlink signaling or channels may include DCI signaling, PDCCH / EPDCCH, etc. If the DRS pattern is always the same, or if the pattern is the same during multiplexing and is known to the UE, DCI signaling may not be used.

[0393] Regarding method C1-2-2, the UE will make at least one of the following assumptions or behaviors:

[0394] The UE needs to perform blind DRS detection in all DRS candidate transmission subframes.

[0395] The UE assumes that the DRS candidate transmission subframe located in subframe 0 / 5 of the data transmission burst will transmit DRS.

[0396] When matching UE rates, it is assumed that PDSCH will not be mapped to the resource element RE occupied by DRS in the DRS candidate transmission subframe located in subframe 0 / 5.

[0397] The time-frequency pattern or signal composition of the DRS transmitted multiplexed with PDSCH may be the same as or different from that of the DRS transmitted alone. However, for the UE, the DRS pattern transmitted multiplexed with PDSCH can be a known pattern, that is, the time-frequency pattern occupied by the DRS in subframe 0 and / or subframe 5 is fixed.

[0398] Alternatively, the downlink signaling or channel sent by the base station can be received. The downlink signaling or channel is used to notify the DRS whether to send and / or rate-matched patterns (or time-frequency patterns sent by the DRS). The downlink signaling or channel may include DCI signaling, PDCCH / EPDCCH, etc.

[0399] Method C1-2-3

[0400] Assuming that subframe 0 and / or subframe 5 are candidate DRS transmission subframes, whether or not DRS is transmitted depends on factors such as the DRS transmission method and LBT results, as in methods B2 / B3.

[0401] For example, whether to send a DRS in subframe 0 and / or subframe 5 also depends on whether the DRS was successfully sent at the previous candidate time point or candidate subframe. If the DRS was successfully sent at the previous candidate time point, subframe 0 and / or subframe 5 may not need to send a DRS. Conversely, a DRS may be sent in subframe 0 and / or subframe 5.

[0402] If a DRS is sent in subframe 0 and / or subframe 5, the PDSCH will not be mapped to the resource element RE occupied by the DRS in subframe 0 and / or subframe 5.

[0403] If subframe 0 and / or subframe 5 do not send DRS, then PDSCH can be sent normally and can be mapped to the time-frequency resources corresponding to the DRS time-frequency pattern.

[0404] Whether to transmit DRS in the candidate transmission subframe of subframe 0 / 5 can be explicitly notified to the UE via downlink signaling or channel notification. For example, the DCI signaling can be included in the scheduling signaling. Other non-scheduled UEs can perform blind detection. Information on whether DRS is transmitted and / or DRS configuration information (such as time-frequency pattern and / or DRS time-frequency pattern type) can also be transmitted via broadcast.

[0405] Regarding method C1-2-3, the UE will make at least one of the following assumptions or behaviors:

[0406] The UE can perform blind DRS detection in all DRS candidate subframes. For example, a non-serving UE.

[0407] The UE receives downlink signaling or channels sent by the base station. The downlink signaling or channels are used to notify the DRS whether to send and / or rate-matched patterns (or time-frequency patterns sent by the DRS). The downlink signaling or channels may include DCI signaling, PDCCH / EPDCCH, etc.

[0408] The UE can receive broadcast information to obtain information on whether a DRS is transmitted at a candidate time point or in a candidate transmission subframe, and / or the rate matching pattern (or the time-frequency pattern of the DRS transmission). If the DRS patterns are the same (preferably the same), DCI signaling may not be required.

[0409] The UE assumes that the PDSCH will not map to the resource element (RE) occupied by the DRS on subframes 0 / 5. That is, the UE will determine whether the DRS has been transmitted and / or the DRS time-frequency pattern information based on blind detection or received downlink signaling / channel / broadcast information, and will then punch holes in the REs occupied by the DRS. If no DRS transmission is detected, there is no need to punch holes in the REs corresponding to the DRS time-frequency pattern.

[0410] Method C2:

[0411] LAA DRS can be multiplexed with PDSCH and transmitted in the same subframe. This same subframe includes subframe 0, and / or subframe 5, and / or other subframes.

[0412] The effect of this method: Method C1 allows DRS and PDSCH to be multiplexed and transmitted within the same subframe (0 / 5), but not in other subframes. In subframes other than 0 / 5, either DRS is transmitted without PDSCH, or PDSCH is transmitted without DRS, which either reduces data transmission efficiency or reduces the opportunities for DRS transmission. Method C2 allows multiplexing and transmission in any subframe, thus solving the above problems.

[0413] Specific reuse methods may include:

[0414] Method C2-1:

[0415] If the data transmission burst time period contains a DRS candidate transmission subframe or a DRS candidate time point, then regardless of whether a DRS should be transmitted at that DRS candidate subframe or candidate time point (whether a DRS is transmitted at a DRS candidate time point also depends on factors such as the DRS transmission method and LBT results, such as methods B2 / B3. Some DRS candidate time points will only attempt to transmit a DRS if all previous DRS transmissions at the candidate time points have failed), a DRS will be transmitted at that DRS candidate subframe or candidate time point.

[0416] PDSCH can be multiplexed with DRS in the same subframe, but PDSCH will not be mapped to the resource element RE occupied by DRS in the same subframe.

[0417] The DRS time-frequency pattern or signal composition transmitted multiplexed with PDSCH can be the same as or different from that transmitted separately. Method one is that the DRS always uses the same time-frequency pattern or signal composition, meaning the same pattern is used for both separate and PDSCH-multiplexed transmissions. Method two is that when the DRS is transmitted separately, a predefined pattern 1 DRS is transmitted to meet time-domain continuity and bandwidth usage rules. When transmitted with PDSCH, control / broadcast information, new reference signals (RS), or other information or signals are not needed to meet time-domain continuity and rule requirements; instead, a predefined pattern 2 DRS is transmitted. Furthermore, when transmitted with PDSCH, the DRS time-frequency pattern and signal composition are relatively fixed or identical, and the DRS time-frequency pattern transmitted with PDSCH is the same. Method three is that regardless of whether the DRS is transmitted separately or multiplexed with PDSCH, the DRS time-frequency pattern and signal composition may differ, or a limited range of DRS pattern types may be selected for transmission. Method two is preferred.

[0418] The base station can send downlink signaling, such as DCI signaling, to indicate whether DRS is being sent and / or DRS configuration information (such as time-frequency patterns and / or DRS time-frequency pattern types). This method is particularly suitable for method three described above.

[0419] The base station can send downlink signaling or channels to notify the DRS whether to send and / or rate-matched patterns (or time-frequency patterns sent by the DRS). Downlink signaling or channels may include DCI signaling, PDCCH / EPDCCH, etc. If the DRS pattern is always the same, or if the pattern is the same during multiplexing and is known to the UE, DCI signaling may not be used.

[0420] Regarding method C2-1, the UE will make at least one of the following assumptions or behaviors:

[0421] The UE performs blind DRS detection in all DRS candidate transmission subframes.

[0422] The UE assumes that all DRS candidate transmission subframes or candidate time points in the data transmission burst will transmit DRS.

[0423] When matching UE rates, it is assumed that PDSCH will not be mapped to the DRS candidate transmission subframe in the data transmission burst or the resource element RE occupied by DRS at the candidate time point.

[0424] The DRS time-frequency pattern or signal composition multiplexed with PDSCH may be the same as or different from that of DRS transmitted alone, but for the UE, the multiplexed DRS pattern can be a known pattern. That is, the DRS time-frequency pattern or resource usage transmitted together with PDSCH is the same.

[0425] Alternatively, the downlink signaling or channel sent by the base station can be received. The downlink signaling or channel is used to notify the DRS whether to send and / or rate-matched patterns (or time-frequency patterns sent by the DRS). The downlink signaling or channel may include DCI signaling, PDCCH / EPDCCH, etc.

[0426] Method C2-2:

[0427] If the data transmission burst time period includes a DRS candidate transmission subframe or candidate time point, whether or not to transmit the DRS in the DRS candidate transmission subframe or DRS candidate time point depends on factors such as the DRS transmission method and LBT results, as in methods B2 / B3.

[0428] If the DRS candidate transmission subframe or candidate time point transmits the DRS, the PDSCH will not be mapped to the resource element RE occupied by the DRS in the subframe or DRS time point.

[0429] If the DRS candidate transmission subframe or candidate time point does not transmit DRS, then PDSCH can be transmitted normally and can be mapped to the time-frequency resources corresponding to the DRS time-frequency pattern.

[0430] The eNB can explicitly notify the UE via downlink signaling whether to transmit DRS and / or DRS configuration information (such as time-frequency patterns, and / or signal composition, ports, etc.) at candidate transmission subframes or candidate time points. For example, this DCI signaling can be included in scheduling signaling. Other non-scheduled UEs can blindly detect DRS. Alternatively, the eNB can broadcast information such as whether DRS is being transmitted and / or DRS configuration information (such as time-frequency patterns, and / or signal composition, ports, etc.).

[0431] Regarding method C2-2, the UE will make at least one of the following assumptions or behaviors:

[0432] The UE can perform blind DRS detection in all DRS candidate subframes. For example, a non-serving UE.

[0433] The UE receives downlink signaling or channels sent by the base station. The downlink signaling or channels are used to notify the DRS whether to send and / or rate-matched patterns (or time-frequency patterns sent by the DRS). The downlink signaling or channels may include DCI signaling, PDCCH / EPDCCH, etc.

[0434] The UE can receive broadcast information to obtain information on whether to send DRS at candidate time points or candidate transmission subframes, and / or DRS configuration information (such as time-frequency patterns, and / or signal composition, ports, etc.).

[0435] The UE assumes that the PDSCH will not map to the resource element (RE) occupied by the DRS in the DRS candidate transmission subframe. That is, the UE will obtain whether the DRS has been transmitted and / or the DRS time-frequency pattern information based on the results of blind detection or receiving downlink signaling / channel / broadcast information, and then punch holes in the REs occupied by the DRS. If no DRS transmission is detected, there is no need to punch holes in the REs corresponding to the DRS time-frequency pattern.

[0436] Method C2-3:

[0437] If a data transmission burst time period contains a DRS candidate transmission subframe or a DRS candidate time point, the PDSCH will not be mapped to the time-frequency resources corresponding to the first DRS candidate time point or the first DRS candidate subframe in the time period. Instead, the PDSCH can be mapped to the time-frequency resources corresponding to the remaining DRS candidate time points or candidate subframes.

[0438] The DRS time-frequency pattern or signal composition transmitted multiplexed with PDSCH can be the same as or different from that transmitted separately. Method one is that the DRS always uses the same time-frequency pattern or signal composition, meaning the same pattern is used for both separate and PDSCH-multiplexed transmissions. Method two is that when the DRS is transmitted separately, a predefined pattern 1 DRS is transmitted to meet time-domain continuity and bandwidth usage rules. When transmitted with PDSCH, control / broadcast information, new reference signals (RS), or other information or signals are not needed to meet time-domain continuity and rule requirements; instead, a predefined pattern 2 DRS is transmitted. Furthermore, when transmitted with PDSCH, the DRS time-frequency pattern and signal composition are relatively fixed or identical, and the DRS time-frequency pattern transmitted with PDSCH is the same. Method three is that regardless of whether the DRS is transmitted separately or multiplexed with PDSCH, the DRS time-frequency pattern and signal composition may differ, or a limited range of DRS pattern types may be selected for transmission. Method two is preferred.

[0439] The base station can send downlink signaling or channels to notify the DRS whether to send and / or rate-matched patterns (or configuration information sent by the DRS, such as time-frequency patterns, ports, etc.). Downlink signaling or channels can include DCI signaling, PDCCH / EPDCCH, etc. If the DRS pattern is always the same, or if the pattern is the same during multiplexing and is known to the UE, DCI signaling may not be used.

[0440] Regarding method C2-3, the UE will make at least one of the following assumptions or behaviors:

[0441] The UE performs blind DRS detection in all DRS candidate transmission subframes.

[0442] The UE assumes that the first DRS candidate transmission subframe or candidate time point in the data transmission burst will transmit DRS; other DRS candidate transmission subframes or candidate time points will not transmit DRS.

[0443] When matching UE rates, it is assumed that PDSCH will not be mapped to the first DRS candidate transmission subframe in the data transmission burst or the resource element RE occupied by DRS at the candidate time point.

[0444] The DRS time-frequency pattern or signal composition multiplexed with PDSCH may be the same as or different from that of DRS transmitted alone, but for the UE, the multiplexed DRS pattern can be a known pattern. That is, the DRS time-frequency pattern or resource usage transmitted together with PDSCH is the same.

[0445] Alternatively, the downlink signaling or channel sent by the base station can be received. The downlink signaling or channel is used to notify the DRS whether to send and / or rate-matched patterns (or configuration information sent by the DRS, such as time-frequency patterns and / or ports). The downlink signaling or channel may include DCI signaling, PDCCH / EPDCCH, etc.

[0446] Furthermore, based on method C2-2, restrictions can be placed on the multiplexing of PDSCH and DRS on subframe 0 and / or subframe 5, with the restriction methods being the same as those in methods C1-2-1, C1-2-2, and C1-2-3.

[0447] The sequence numbers of the above embodiments of the present invention are merely for descriptive purposes and do not represent the superiority or inferiority of the embodiments. Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases, the former is a better implementation method. Based on this understanding, the technical solutions of the embodiments of the present invention, or the parts that contribute to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0448] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A method for discovering signal and Physical Downlink Shared Channel (PDSCH) multiplexing transmission, applied to a base station, the method comprising: Within the data transmission time period, determine the subframe in the data transmission time period in which the Discovery Signal (DRS) is transmitted; PDSCH is multiplexed on the subframes in which DRS is transmitted during the data transmission time period; The subframe used for transmitting DRS is a DRS candidate subframe, and according to the DRS transmission strategy, this subframe should transmit DRS. The time period for candidate DRS transmission is called the DRS candidate time point. When the DRS candidate time point is equal to one subframe, the DRS candidate subframe is the DRS candidate time point; or, when the DRS candidate time point is less than one subframe, the DRS candidate subframe refers to the subframe containing the DRS candidate time point; or, when the DRS candidate time point is greater than one subframe, each subframe contained in the DRS candidate time point is the DRS candidate subframe. The DRS transmission strategy includes transmitting DRS on DRS candidate subframes that meet the following conditions during the data transmission time period: The DRS candidate subframe is the i-th DRS candidate subframe in the data transmission time period, where i takes the value of 1, 2, ..., I, and I is the number of DRS candidate subframes in the data transmission time period.

2. The method as described in claim 1, characterized in that: Multiplexing the PDSCH transmission on a subframe includes: Map the PDSCH to symbols in the subframe other than those transmitting DRS; and / or Map the PDSCH to the resource elements in the symbols of the DRS transmitted in the subframe, excluding the resource elements corresponding to the DRS pattern.

3. The method as described in claim 1, characterized in that: The method further includes: When DRS is transmitted separately on a subframe, the DRS pattern used in that subframe adopts one of the first pattern or the first set of patterns. When multiplexing PDSCH in a subframe, the DRS pattern used in that subframe adopts one of the second pattern or the second set of patterns. Wherein, the second pattern is the same as or different from the first pattern, and the second set of patterns is the same as or different from the first set of patterns; The pattern in the first pattern or the first group of patterns includes DRS and fill information; When the second pattern differs from the first pattern, the second pattern includes DRS but does not include fill information; when the second set of patterns differs from the first set of patterns, the patterns in the second set of patterns include DRS but do not include fill information. The filling information is information other than PDSCH and DRS, which is filled in to meet the requirements of time domain continuity and / or bandwidth usage.

4. The method as described in claim 1, characterized in that, DRS configuration information and / or DRS transmission information for the data transmission period are sent to the terminal through one or more of downlink control signaling, downlink control channel and broadcast information; The DRS configuration information includes one or more of the following: Information on whether the DRS pattern used when sending DRS separately is the same as the DRS pattern used when sending DRS and multiplexing PDSCH; Information from the DRS diagram; Information about the port that sends the DRS component signal; Information composed of DRS signals; The DRS transmission information during the data transmission period includes one or more of the following: Whether to send DRS information during the data transmission time period; The location information of the subframes for transmitting DRS during the data transmission time period.

5. A method for receiving the Physical Downlink Shared Channel (PDSCH) during a data transmission period, applied to a terminal, comprising: When receiving data during a data transmission period, the first subframe within that data transmission period is determined. The first subframe refers to the subframe that transmits PDSCH and the PDSCH can only be mapped to resource elements other than the resource elements corresponding to the DRS pattern of the first subframe. Receive PDSCH on the first subframe; Determining the first subframe within the data transmission time period includes: According to the first agreement between the terminal and the base station, the second subframe in the data transmission time period is determined; the second subframe refers to the subframe in which the resource element corresponding to the DRS pattern has been occupied by information other than PDSCH or no information is being transmitted. According to the second agreement between the terminal and the base station, it is determined whether PDSCH is multiplexed in the second subframe. If so, the second subframe is the first subframe in the data transmission time period. The first agreement includes: The second subframe is a DRS candidate subframe during the data transmission period, and according to the DRS transmission strategy, this subframe should transmit DRS. The time period for candidate DRS transmission is called the DRS candidate time point. When the DRS candidate time point is equal to one subframe, the DRS candidate subframe is the DRS candidate time point; or, when the DRS candidate time point is less than one subframe, the DRS candidate subframe refers to the subframe containing the DRS candidate time point; or, when the DRS candidate time point is greater than one frame, each subframe contained in the DRS candidate time point is the DRS candidate subframe. The DRS candidate subframe is the i-th DRS candidate subframe in the data transmission time period, where i takes the value of 1, 2, ..., I, and I is the number of DRS candidate subframes in the data transmission time period. The second agreement includes: The PDSCH is multiplexed and transmitted on the second subframe during the data transmission period.

6. The method as described in claim 5, characterized in that: The DRS pattern of the first subframe is determined according to the third agreement between the terminal and the base station and / or the third indication information sent by the base station; The third agreement includes: When the first information is transmitted separately in a subframe, the DRS pattern used in that subframe is either the first pattern or one of the first set of patterns. When multiplexing the first information and PDSCH in a subframe, the DRS pattern used in that subframe is a second pattern or one of the second set of patterns; Wherein, the second pattern may be the same as or different from the first pattern, and the second set of patterns may be the same as or different from the first set of patterns.

7. The method as described in claim 5 or 6, characterized in that: The method further includes: Obtain one or more of the following information from one or more of downlink control signaling, downlink control channel, and broadcast information: The first indication information is used to indicate the second subframe within the data transmission time period; The second indication information is used to indicate whether to multiplex the transmission of PDSCH on the second subframe; The third indication information is used to indicate the DRS pattern used on the first subframe.

8. A base station, characterized in that, include: The determination module is used to determine, within the data transmission time period, the subframe in which the discovery signal DRS is transmitted during the data transmission time period; The multiplexing module is used to multiplex the transmission of PDSCH on the subframes in which DRS is transmitted during the data transmission time period; The determining module determines that the subframe used for transmitting DRS is a DRS candidate subframe, and according to the DRS transmission strategy, the subframe should transmit DRS. The time period for the candidate DRS transmission is called the DRS candidate time point. When the DRS candidate time point equals one subframe, the DRS candidate subframe is the DRS candidate time point; or, when the DRS candidate time point is less than one subframe, the DRS candidate subframe refers to the subframe containing the DRS candidate time point; or, when the DRS candidate time point is greater than one frame, each subframe contained in the DRS candidate time point is the DRS candidate subframe. The DRS transmission strategy includes: transmitting DRS on DRS candidate subframes that meet the following conditions during the data transmission time period: The DRS candidate subframe is the i-th DRS candidate subframe in the data transmission time period, where i takes the value of 1, 2, ..., I, and I is the number of DRS candidate subframes in the data transmission time period.

9. A terminal, characterized in that, include: The determining module is used to determine the first subframe in the data transmission time period when receiving data during the data transmission time period; The first subframe refers to the subframe that transmits PDSCH and the PDSCH can only be mapped to resource elements other than the resource elements corresponding to the DRS pattern of the first subframe. A receiving module, used to receive PDSCH on the first subframe; The determining module determines the first subframe within the data transmission time period, including: According to the first agreement between the terminal and the base station, the second subframe in the data transmission time period is determined; the second subframe refers to the subframe in which the resource element corresponding to the DRS pattern has been occupied by information other than PDSCH or no information is being transmitted. According to the second agreement between the terminal and the base station, it is determined whether PDSCH is multiplexed in the second subframe. If so, the second subframe is the first subframe in the data transmission time period. The first agreement includes: The second subframe is a DRS candidate subframe during the data transmission period, and according to the DRS transmission strategy, this subframe should transmit DRS. The time period for candidate DRS transmission is called the DRS candidate time point. When the DRS candidate time point is equal to one subframe, the DRS candidate subframe is the DRS candidate time point; or, when the DRS candidate time point is less than one subframe, the DRS candidate subframe refers to the subframe containing the DRS candidate time point; or, when the DRS candidate time point is greater than one frame, each subframe contained in the DRS candidate time point is the DRS candidate subframe. The DRS candidate subframe is the i-th DRS candidate subframe in the data transmission time period, where i takes the value of 1, 2, ..., I, and I is the number of DRS candidate subframes in the data transmission time period. The second agreement includes: The PDSCH is multiplexed and transmitted on the second subframe during the data transmission period.

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