Method, device and system for wireless communication in a wireless communication system

Abstract

The present disclosure relates to a method, device and system for wireless communication in a wireless communication system. The wireless communication system includes a low-power node and a macro base station and a user equipment sharing a common baseband, and the user equipment communicates with the low-power node and the macro base station through multiple component carriers. The method according to the present disclosure includes: receiving, by the user equipment, a downlink signal transmitted by the low-power node and the macro base station; and transmitting an uplink signal to the low-power node and the macro base station, wherein the method further includes: sending all the first uplink signals in the uplink signal to the low-power node as a receiving node. According to the method, device and system of the present disclosure, the efficiency of the terminal uplink power control can be improved, and / or the burden of the macro cell uplink control channel transmission can be reduced.

Description

[0001] This application is a divisional application of the Chinese patent application filed on May 28, 2013, with application number 201310202975.8 and invention name “Method, device and system for wireless communication in a wireless communication system”. Technical Field

[0002] The present disclosure relates to the technical field of wireless communications, and in particular to a method, a wireless communication device, and a wireless communication system for performing wireless communications in a wireless communication system. Background Art

[0003] This section provides background information related to the present disclosure which is not necessarily prior art.

[0004] Carrier aggregation before Long Term Evolution (LTE) Rel-11 is the carrier aggregation of a single base station node. The aggregated carrier of a terminal consists of 1 primary component carrier and at least 1 secondary component carrier. Among them, in the frequency division duplex (FDD) mode, the downlink primary component carrier and the uplink primary component carrier are determined by the system information block type 2 (SIB2) message association. The physical uplink control channel (PUCCH) signal is transmitted on the uplink primary component carrier. Under normal circumstances, only one uplink component carrier is used for uplink data transmission. The change of the primary component carrier means the occurrence of switching behavior.

[0005] In the case of carrier aggregation between base stations, if the macro base station and the low-power node do not share the baseband, uplink carrier aggregation occurs, and the original primary component carrier settings and association rules are still valid. Since the component carrier of the macro base station is mainly used for data transmission related to mobility control, the primary component carrier will include the downlink component carrier of the macro base station. If the uplink primary component carrier is still associated according to SIB2, it cannot help the macro base station to perform PUCCH offload to reduce the burden on the macro cell uplink control channel when the macro base station and the low-power node share the baseband transmission. In addition, when the macro base station and the low-power node perform multi-point coordinated (CoMP) transmission, especially when the macro base station is used as an uplink receiving node, accurate power control cannot be performed. Moreover, the solution of uplink power control with the macro base station as the receiving node is not conducive to reducing the energy consumption of the user equipment (UE). Summary of the invention

[0006] This section provides a general summary of the disclosure, and is not a comprehensive disclosure of its full scope or all of its features.

[0007] The purpose of the present disclosure is to provide a method, a wireless communication device and a wireless communication system for performing wireless communication in a wireless communication system, which can improve the efficiency of terminal uplink power control and / or reduce the burden of macrocell uplink control channel transmission.

[0008] According to one aspect of the present disclosure, a method for performing wireless communications in a wireless communication system is provided, wherein the wireless communication system includes a low-power node and a macro base station and a user equipment sharing a common baseband, wherein the user equipment communicates with the low-power node and the macro base station via multiple component carriers, and the method includes: receiving, by the user equipment, a downlink signal transmitted by the low-power node and the macro base station; and transmitting an uplink signal to the low-power node and the macro base station, wherein the method further includes: sending all first uplink signals in the uplink signals to the low-power node serving as a receiving node.

[0009] According to another aspect of the present disclosure, a wireless communication device is provided for communicating with a low-power node and a macro base station in a common baseband via multiple component carriers, the wireless communication device comprising: a receiving unit for receiving downlink signals transmitted by the low-power node and the macro base station; a transmission unit for transmitting uplink signals to the low-power node and the macro base station; and a control unit for controlling the transmission unit to send all first uplink signals in the uplink signals to the low-power node serving as a receiving node.

[0010] According to another aspect of the present disclosure, a wireless communication system is provided, which includes: a macro base station; a low-power node, which shares a baseband with the macro base station; and a wireless communication device according to the present disclosure, which communicates with the low-power node and the macro base station through multiple component carriers.

[0011] According to the method, wireless communication device and wireless communication system for performing wireless communication in a wireless communication system disclosed in the present invention, the efficiency of terminal uplink power control can be improved and / or the burden of macro cell uplink control channel transmission can be reduced by sending all first uplink signals in the uplink signals to a low-power node serving as a receiving node.

[0012] Further areas of applicability will become apparent from the description provided herein.The description and specific examples in this summary are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present disclosure. In the drawings:

[0014] Figure 1 is a schematic diagram illustrating a scenario of carrier aggregation between base stations;

[0015] Figure 2 is a flow chart illustrating a method for wireless communication in a wireless communication system according to an embodiment of the present invention;

[0016] Figure 3 is a schematic diagram illustrating co-baseband multi-point cooperative transmission in a heterogeneous network;

[0017] Figure 4 is a flow chart illustrating a method for wireless communication in a wireless communication system according to another embodiment of the present disclosure;

[0018] Figure 5 is a flow chart illustrating a method for wireless communication in a wireless communication system according to another embodiment of the present disclosure;

[0019] Figure 6 is a block diagram illustrating a wireless communication system according to an embodiment of the present disclosure; and

[0020] Figure 7 The present invention is a block diagram of an exemplary structure of a general-purpose personal computer in which the method for wireless communication in a wireless communication system according to an embodiment of the present disclosure can be implemented.

[0021] Although the present disclosure is susceptible to various modifications and alternative forms, specific embodiments thereof have been shown as examples in the drawings and are described in detail herein. It should be understood, however, that the description of specific embodiments herein is not intended to limit the present disclosure to the specific forms disclosed, but rather, the present disclosure is intended to cover all modifications, equivalents, and alternatives that fall within the spirit and scope of the present disclosure. It should be noted that throughout the several drawings, corresponding reference numerals indicate corresponding parts. DETAILED DESCRIPTION

[0022] Examples of the present disclosure will now be described more fully with reference to the accompanying drawings.The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses.

[0023] Example embodiments are provided so that the disclosure will be exhaustive and its scope will be fully conveyed to those skilled in the art. Numerous specific details such as examples of specific components, devices and methods are set forth to provide a detailed understanding of the embodiments of the present disclosure. It will be apparent to those skilled in the art that the example embodiments may be implemented in many different forms without the use of specific details, none of which should be construed as limiting the scope of the present disclosure. In certain example embodiments, well-known processes, well-known structures and well-known techniques are not described in detail.

[0024] In such Figure 1In the scenario shown, the macro base station 1 has a wide coverage area called a macro cell, while the low power node 2 has a narrow coverage area called a small cell. The macro base station 1 has a frequency of 2 GHz, for example, and the low power node 2 has a frequency of 3.5 GHz, for example. Carrier aggregation can be performed between the macro base station 1 and the low power node 2. The macro base station 1 can be directly connected to the low power node 2, for example, via an optical fiber 4, so that the macro base station 1 and the low power node 2 share the baseband. The user equipment (UE) 3 can communicate with both the macro base station 1 and the low power node 2 via multiple component carriers.

[0025] As an example, UE 3 performs inter-node carrier aggregation of macro base station 1 and low power node 2, and the aggregated component carriers are carrier a and carrier b. Among them, low power node 2 and macro base station 1 perform CoMP transmission for UE 3 on component carrier a, and UE 3 is served by the low power node alone on carrier b.

[0026] As another example, UE 3 may communicate with macro base station 1 through component carrier c, and communicate with low power node 2 through component carrier d. Component carrier c and component carrier d may be subjected to carrier aggregation (inter-node carrier aggregation).

[0027] In the prior art, in the case of carrier aggregation between the macro base station 1 and the low power node 2, the original primary component carrier settings and association rules are still valid. For example, in FDD mode, SIB2 transmitted by the downlink primary component carrier can be associated with the uplink primary component carrier. Alternatively, in the absence of SIB2 content, UE 3 can confirm the uplink primary component carrier by the default frequency spacing between the downlink primary component carrier and its associated uplink primary component carrier. In time division duplex (TDD) mode, the transmission function of the default downlink primary component carrier and the transmission function of the uplink primary component carrier are performed on the same component carrier.

[0028] Since the component carrier of the macro base station 1 is mainly used for data transmission related to mobility control, the primary component carrier will include the downlink component carrier of the macro base station 1. In this way, based on the original primary component carrier setting and association rules, the primary component carrier will also include the uplink component carrier of the macro base station 1.

[0029] In addition, when UE 3 transmits uplink data on two or more component carriers, if the uplink transmit power exceeds the maximum transmit power under power limitation, uplink sounding reference signal (SRS) / physical uplink control channel (PUCCH) / physical uplink shared channel (PUSCH) information will be discarded, resulting in data transmission loss. Therefore, uplink data transmission is generally carried out on the uplink primary component carrier as much as possible. Figure 1In the case of co-baseband transmission between macro base station 1 and low power node 2, macro base station 1 cannot be helped to offload PUCCH to reduce the burden of macro cell uplink control channel. Moreover, the solution of uplink power control with macro base station 1 as receiving node is not conducive to reducing energy consumption of UE 3.

[0030] In order to reduce the burden of the macro cell uplink control channel and reduce the energy consumption of the UE, an embodiment of the present disclosure provides a method for performing wireless communication in a wireless communication system, such as Figure 2 The wireless communication system includes, for example, Figure 1 The low power node 2, the macro base station 1 and the UE 3 are shown to share a baseband, and the UE 3 communicates with the low power node 2 and the macro base station 1 through multiple component carriers.

[0031] like Figure 2 As shown, in step S210, the user equipment receives a downlink signal transmitted by the low-power node and the macro base station. Figure 1 Schematically illustrates the communication between the macro base station 1 and the low power node 2 and the UE 3. For example, when the UE 3 is within the coverage of both the macro base station 1 and the low power node 3, the macro base station 1 and the UE 3 communicate via the control plane (C-plane), and the low power node 2 and the UE 3 communicate via the user plane (U-plane).

[0032] Next, in step S220, an uplink signal is transmitted to the low-power node and the macro base station. Figure 1 As shown, UE 3 can transmit uplink signals to low-power node 2 and can also transmit uplink signals to macro base station 1.

[0033] Finally, in step S230, all first uplink signals in the uplink signals are sent to the low-power node as the receiving node. The first uplink signal here may include but is not limited to a PUCCH signal and / or a PUSCH signal.

[0034] Different from the prior art in which PUCCH signals and PUSCH signals are transmitted only on the default uplink primary component carrier of the macro base station 1, the method according to the embodiment of the present invention sends all first uplink signals including PUCCH signals and / or PUSCH signals to the low-power node 2 to achieve uplink signal diversion, thereby reducing the burden of the macro cell uplink control channel. In addition, considering that the distance between UE 3 and the low-power node 2 is generally much smaller than the distance between UE 3 and the macro base station 1, using the low-power node 2 as a receiving node for certain uplink signals can help reduce the energy consumption of UE 3.

[0035] When inter-node carrier aggregation is performed for low-power node 2 and macro base station 1, macro base station 1 sets the downlink component carrier of macro base station 1 as the downlink primary component carrier. In this case, the method according to the embodiment of the present disclosure can release the association relationship between the uplink primary component carrier and the downlink primary component carrier. In other words, the original primary component carrier setting and association rules are released. In this way, the transmission of PUCCH signals and PUSCH signals only on the default uplink primary component carrier of macro base station 1 is cancelled.

[0036] At this time, when the wireless communication system is an FDD system, the uplink component carrier of the low-power node 2 can be set as the uplink primary component carrier. In this way, the PUCCH signal and the PUSCH signal transmitted only on the uplink primary component carrier are transmitted to the low-power node 2, thereby realizing the uplink signal splitting.

[0037] On the other hand, when the wireless communication system is a TDD system, the transmission function of the downlink primary component carrier can be performed by the downlink time slot of the component carrier of the macro base station 1, and the transmission function of the uplink primary component carrier can be performed by the uplink time slot of the component carrier of the low power node 2. In this way, the PUCCH signal and the PUSCH signal can also be transmitted to the low power node 2 to achieve the offloading of the uplink signal.

[0038] In addition, if UE 3 aggregates multiple component carriers on low power node 2, and macro base station 1 does not work on these component carriers, macro base station 1 (or low power node 2) can notify UE 3 of the uplink primary component carrier on low power node 2 through radio resource control (RRC), medium access control (MAC) or physical layer downlink control information (DCI). UE3 can learn the uplink primary component carrier on low power node 2 by receiving RRC, MAC or physical layer DCI. Alternatively, UE 3 can also select the component carrier with the highest or lowest frequency among these component carriers as the uplink primary component carrier of UE 3 on low power node 2 by default.

[0039] Further, when the inter-node carrier aggregation for the low-power node 2 and the macro base station 1 ends, the macro base station 1 (or the low-power node 2) can notify the restoration of the association relationship between the uplink main component carrier and the downlink main component carrier through RRC, MAC or DCI of the physical layer. UE 3 can be informed of the restoration of the association relationship between the uplink main component carrier and the downlink main component carrier by receiving DCI of RRC, MAC or physical layer. Alternatively, UE 3 can also restore the association relationship between the uplink main component carrier and the downlink main component carrier by default. After restoring the association relationship between the uplink main component carrier and the downlink main component carrier, the uplink component carrier of the macro base station 1 is set as the uplink main component carrier.

[0040] Below Figure 1 Take the following as an example. Figure 1 For the UE 3 shown, if the 2GHz and 3.5GHz component carriers are aggregated, since the small cell is mainly responsible for uplink data transmission, PUCCH and PUSCH will basically be carried out on the 3.5GHz component carrier. At this time, the PUCCH signaling for the macro cell uplink transmission should be integrated into the 3.5GHz uplink component carrier (FDD) / uplink time slot (TDD). At the same time, in order to save the transmission power of UE 3, the uplink signaling interaction between UE 3 and macro base station 1 can also be placed on the 3.5GHz uplink component carrier for transmission. This operation can be performed by default after entering the inter-base station carrier aggregation state, or it can be performed by the downlink main component carrier through RRC / MAC / physical layer signaling.

[0041] if Figure 1 If UE 3 aggregates two or more component carriers in the 3.5 GHz frequency band of the small cell, the downlink primary component carrier specifies the uplink primary component carrier through RRC / MAC / physical layer signaling, or the network and UE 3 default to the component carrier with the highest or lowest uplink frequency in the small cell aggregated carrier as the uplink primary component carrier.

[0042] if Figure 1 The UE 3 shown ends the inter-base station carrier aggregation state, and the downlink primary component carrier notifies the UE 3 to restore the SIB2 association relationship between the uplink and downlink primary component carriers through RRC / MAC / physical layer signaling, or the network and UE 3 automatically restore this relationship by default.

[0043] Figure 3 FIG. 4 shows the topology diagram of the co-baseband CoMP transmission in a heterogeneous network. Figure 3 In the independent cell ID cooperation mode (i.e., CoMP scenario 3) and the single frequency network cooperation mode (i.e., CoMP scenario 4) shown in the figure, the function of decoupling the downlink transmission point and the uplink reception point is supported. At this time, if the uplink and downlink main component carriers are not decoupled, low-power nodes can still be selected as uplink target reception nodes according to precise power control to save the transmission power of uplink PUCCH and PUSCH. At the same time, when sending SRS signals to low-power nodes and macro base stations, precise power control is also required to ensure the correctness of data reception and power consumption efficiency.

[0044] The original uplink power control is based on the path loss of the downlink transmission point. If it is CoMP scenario 4 (integration of the same signal of multiple downlink transmission points), it will undoubtedly cause the downlink channel quality to be overestimated, resulting in the situation where the path loss compensation power is too low, which in turn leads to a decrease in the uplink signal reception quality. On the other hand, if the uplink transmission power is increased due to downlink interference from low-power nodes in CoMP scenario 3, the interference to the low-power nodes will be further enhanced.

[0045] The inventor of the present disclosure proposes to derive uplink power control adjustment parameters of PUSCH and PUCCH based on compensation of inter-frequency measurement, thereby optimizing the transmission result of the entire uplink data.

[0046] In addition, in LTE / LTE-A TDD systems, SRS can be used to determine the uplink transmission time advance, and can also be used to evaluate the downlink channel quality based on the characteristics of uplink and downlink channel reciprocity. The transmission power of the former depends on the set of receiving nodes, while the transmission power of the latter depends on the set of transmitting nodes. The inventors know that fine-tuning can be performed by increasing the power control value range of SRS to minimize the risk of standardization work. The inventors believe that a unified solution is needed to solve the optimization problem of uplink power control in these scenarios.

[0047] Figure 4 The method of path compensation for uplink power control according to an embodiment of the present disclosure is shown. Figure 4 The method shown is applicable to the case where the macro base station and the low power node perform coordinated multi-point transmission on at least a first component carrier and the low power node also communicates with the user equipment through at least a second component carrier.

[0048] like Figure 4 As shown, in step S410, the coordinated downlink path loss when the low-power node performs multi-point coordinated transmission for the user equipment on the first component carrier is estimated with reference to the independent downlink path loss incurred when the low-power node transmits a downlink signal for the user equipment on the second component carrier.

[0049] The individual downlink path loss may be obtained based on the transmit power of the low-power node when transmitting a cell-specific reference signal (CRS) individually and the reference signal received power (RSRP) of the cell-specific reference signal (CRS) of the low-power node detected linearly.

[0050] Next, in step S420, based on the coordinated downlink path loss, the uplink path loss of the uplink signal sent by the user equipment with the low-power node as the target receiving node on the first component carrier is estimated to perform uplink signal transmission power compensation.

[0051] Figure 5An example of a method for estimating uplink path loss is shown. Specifically, in step S510, the transmit power of the low-power node when transmitting CRS alone can be subtracted from the RSRP of the CRS of the low-power node detected linearly to obtain the individual downlink path loss. This can be expressed by the following expression (1).

[0052]

[0053] in,

[0054] Indicates the path loss of the low power node (LPN) in decibels (dB); TxPower(LPN_CRS) dB : indicates the transmit power in dB when the LPN transmits CRS alone; and

[0055] Indicates the RSRP of the CRS of the LPN for line detection.

[0056] Next, in step S520, considering the frequency interval between the low-power node's independent transmission carrier and the CoMP carrier, the frequency point height, the distance between the terminal and the low-power node, and historical statistical information, the single downlink path loss can be used to calculate the distance between the low-power node's independent transmission carrier and the CoMP carrier. Estimation of the cooperative downlink path loss when low-power nodes transmit downlink signals in a CoMP manner Downlink path loss only and cooperative downlink path loss The deviation value between the two is related to the operating frequency points of the two carriers, the frequency offset, the transmission environment of the low-power node, and the specific location of the terminal in the coverage range of the low-power node.

[0057] After that, in step S530, for example, according to the reciprocity characteristics of the uplink and downlink channels, the coordinated downlink path loss The simplest approach is to assume that the uplink path loss is equal to the collaborative downlink path loss.

[0058] In this way, the uplink power control adjustment parameters of the uplink signal with the low-power node as the target receiving node are derived based on the compensation of the inter-frequency measurement, thereby optimizing the transmission result of the entire uplink data. The uplink signal here can include PUSCH, PUCCH and SRS.

[0059] Regarding the specific power compensation method, when the uplink signal is PUSCH, for example, compensation can be performed using the following expression (2):

[0060] P = min {P max ,10logM+P0_PUSCH (j)+α(j)PL+Δ TF +f(i)} (2)

[0061] in,

[0062] P: indicates the closed-loop power of PUSCH (i.e., the power provided by the terminal to transmit the PUSCH signal);

[0063] P max : Indicates the maximum power;

[0064] M: indicates the number of resource blocks (RB);

[0065] P 0_PUSCH (j): indicates the power reference value set by high-layer signaling, which is used to reflect the noise level of the uplink receiving end;

[0066] α(j): indicates the path loss compensation coefficient;

[0067] PL: indicates the uplink path loss estimated by the method of the present disclosure;

[0068] Δ TF : indicates the power offset; and

[0069] f(i): indicates the adjustment value.

[0070] When the uplink signal is a PUCCH, compensation can be performed, for example, by the following expression (3):

[0071] P = min {P max ,P 0_PUSCH (j)+PL+h(n CQI ,n HARQ )+Δ F_PUCCH (F)+g(i)} (3)

[0072] in,

[0073] P: indicates the closed-loop power of PUCCH (i.e., the power provided by the terminal to transmit the PUCCH signal); Pmax: indicates the maximum power;

[0074] P 0_PUSCH (j): indicates the power reference value set by high-layer signaling, which is used to reflect the noise level of the uplink receiving end;

[0075] PL: indicates the uplink path loss estimated by the method of the present disclosure;

[0076] h(n CQI ,n HARQ ): indicates the offset of the transmit power of PUCCH;

[0077] ΔF_PUCCH (F): a power offset indicating the transmit power of another PUCCH; and g(i): an adjustment value.

[0078] When the uplink signal is SRS, compensation can be performed, for example, by the following expression (4):

[0079] P = min {P max ,P SRS_OFFSET +10logM SRS +P 0_PUSCH (j)+α(j)PL+Δ TF +f(i)} (4)

[0080] in,

[0081] P: indicates the closed-loop power of SRS (i.e., the power provided by the terminal to transmit the SRS signal);

[0082] Pmax: indicates the maximum power;

[0083] P SRS_OFFSET : Indicates the power offset used for SRS;

[0084] M SRS : Indicates the number of resource blocks required for SRS;

[0085] P 0_PUSCH (j): indicates the power reference value set by high-layer signaling, which is used to reflect the noise level of the uplink receiving end;

[0086] α(j): indicates the path loss compensation coefficient;

[0087] PL: indicates the uplink path loss estimated by the method of the present disclosure;

[0088] Δ TF : indicates the power offset; and

[0089] f(i): indicates the adjustment value.

[0090] The above expressions (2)-(4) are the closed-loop power control formulas for PUSCH, PUCCH and SRS respectively. For open-loop power control, power compensation can be performed by the following expression (5):

[0091] PSD Tx =P 0 +α·PL (5)

[0092] in,

[0093] PSD TX : Indicates open loop power;

[0094] P0 : indicates the power reference value set by the high-level signaling, which is used to reflect the noise level of the uplink receiving end; α: indicates the path loss compensation coefficient; and

[0095] PL: indicates the uplink path loss estimated by the method of the present disclosure.

[0096] The above describes the derivation of uplink power control adjustment parameters of uplink signals with low-power nodes as target receiving nodes. In the case where macro base stations are the target receiving nodes, the derivation of uplink power control adjustment parameters of uplink signals can also be performed.

[0097] According to an embodiment of the present disclosure, based on the coordinated downlink path loss of the low-power node, the coordinated downlink path loss when the macro base station performs multi-point coordinated transmission for the user equipment on the first component carrier can be estimated.

[0098] Specifically, for example, the receiving power of the low-power node can be obtained based on the transmission power of the low-power node when transmitting a cell-specific reference signal (CRS), data or channel state information pilot (CSI-RS) for the user equipment in a multi-point coordinated transmission mode on the first component carrier and the collaborative downlink path loss of the low-power node.

[0099] Further, the received power of the macro base station may be obtained according to the linearly detected RSRP of the CRS of the low-power node and the macro base station and the received power of the low-power node.

[0100] Furthermore, according to the transmission power of the macro base station when transmitting CRS for the user equipment in the coordinated multi-point transmission mode on the first component carrier and the receiving power of the macro base station, the coordinated downlink path loss of the macro base station can be obtained.

[0101] Next, based on the coordinated downlink path loss of the macro base station, the uplink path loss of the uplink signal sent by the user equipment on the first component carrier with the macro base station as the target receiving node can be estimated to perform uplink signal transmission power compensation.

[0102] The uplink signal here can also include PUSCH, PUCCH and SRS. Of course, as mentioned above, if the PUCCH signal and PUSCH signal transmitted only on the uplink main component carrier are all transmitted to the low-power node in order to achieve the uplink signal splitting, the uplink signal with the macro base station as the target receiving node can only include the SRS signal, so as to infer the quality of the downlink channel of the macro base station based on the reciprocity of the uplink and downlink channels.

[0103] Regarding the specific method for estimating the uplink path loss of the uplink signal sent by the user equipment with the macro base station as the target receiving node (hereinafter simply referred to as "the uplink path loss of the macro base station"), the above-mentioned expression (1) can also be used. Specifically, first, the transmit power TxPower(LPN_CRS) when the low-power node transmits CRS alone can be dB , minus the reference signal received power of the CRS of the low-power node detected by linear detection To obtain the individual downlink path loss of the low power node

[0104] Next, considering the frequency interval between the low-power node's independent transmission carrier and the CoMP carrier, the frequency point height, the distance between the terminal and the low-power node, and historical statistical information, the single downlink path loss can be used to calculate the distance between the low-power node and the CoMP carrier. Estimation of the cooperative downlink path loss when low-power nodes transmit downlink signals in CoMP mode

[0105] After that, for example, according to the reciprocity characteristics of the uplink and downlink channels, the collaborative downlink path loss of the low-power nodes can be estimated. To further estimate the uplink path loss of the uplink signal sent by the user equipment with the low-power node as the target receiving node (hereinafter simply referred to as "the uplink path loss of the low-power node").

[0106] When the CoMP transmission mode is the single frequency network cooperation mode (i.e., CoMP scenario 4), based on the estimated cooperative downlink path loss of the low-power node To further estimate the uplink path loss of the macro base station, the following expression (6) can be used:

[0107]

[0108] in,

[0109] TxPower(Macro_CRS) dB : Indicates the transmit power of the macro base station when cooperating to transmit CRS in dB; Indicates the path loss of the macro base station in dB;

[0110] TxPower(LPN_CRS) dB : indicates the transmit power in dB of low power nodes (LPNs) when cooperating to transmit CRS; and

[0111] Indicates the RSRP of the CRS of the macro base station and the low power node for linear detection.

[0112] Specifically, first, the transmit power TxPower(LPN_CRS) when the low-power node transmits CRS in CoMP transmission mode can be dB , minus the estimated cooperative downlink path loss of the low-power node To obtain the received power of low-power nodes.

[0113] Furthermore, the reference signal received power of the CRS of the low-power node and the macro base station detected by linear Subtract the received power of the low-power node to obtain the received power of the macro base station.

[0114] Furthermore, the transmit power TxPower(Macro_CRS) when the macro base station transmits CRS in CoMP transmission mode can be dB , minus the received power of the macro base station to obtain the coordinated downlink path loss of the macro base station

[0115] Finally, according to the reciprocity of uplink and downlink channels, the downlink path loss of the macro base station can be calculated based on the collaborative downlink path loss of the macro base station. To estimate the uplink path loss of the macro base station. For example, referring to the above expressions (2)-(5), the path loss PL is replaced by The uplink transmit power value of PUSCH / PUCCH / SRS of closed-loop power control and the uplink transmit power value of open-loop power control can be derived.

[0116] When the CoMP transmission mode is independent cell ID cooperation mode (i.e., CoMP scenario 3), the estimated cooperative downlink path loss of the low-power node is To further estimate the uplink path loss of the macro base station, the following expression (7) can be used:

[0117]

[0118] in,

[0119] TxPower(Macro_CRS) dB : Indicates the transmit power of the macro base station when cooperating to transmit CRS in dB; Indicates the path loss of the macro base station in dB;

[0120] TxPower(LPN_Data / LPN_CSI) dB : indicates the transmit power in dB of a low power node (LPN) when cooperating to transmit a data signal or a channel state information pilot (CSI-RS); and Indicates the RSRP of the CRS of the macro base station and the low power node for linear detection.

[0121] Specifically, first, the transmit power TxPower (LPN_Data / LPN_CSI) when the low-power node transmits a data signal or CSI-RS in the CoMP transmission mode can be calculated. dB , minus the estimated cooperative downlink path loss of the low-power node To obtain the received power of low-power nodes.

[0122] Furthermore, the reference signal received power of the CRS of the low-power node and the macro base station detected by linear Subtract the received power of the low-power node to obtain the received power of the macro base station.

[0123] Furthermore, the transmit power TxPower(Macro_CRS) when the macro base station transmits CRS in CoMP transmission mode can be dB , minus the received power of the macro base station to obtain the coordinated downlink path loss of the macro base station

[0124] Finally, according to the reciprocity of uplink and downlink channels, the downlink path loss of the macro base station can be calculated based on the collaborative downlink path loss of the macro base station. To estimate the uplink path loss of the macro base station. For example, referring to the above expressions (2)-(5), the path loss PL is replaced by The uplink transmit power value of PUSCH / PUCCH / SRS of closed-loop power control and the uplink transmit power value of open-loop power control can be derived.

[0125] It can be understood that in the above expression (7), indicates the power of the macro base station in transmitting CRS to the terminal (the received power of the macro base station), and It indicates the power of the low-power node transmitting the data signal or CSI-RS to the terminal (the received power of the low-power node). Adding the above two powers together, we get the reference signal received power of the CRS of the low-power node and the macro base station for linear detection.

[0126] However, the reference signal received power of the CRS of the low-power node and the macro base station in the linear detection In the calculation of , the received power of the macro base station and the received power of the low-power node may not only be superimposed on each other, but also cancel each other out. In the case where the received power of the macro base station and the received power of the low-power node cancel each other out, the uplink path loss of the macro base station can be estimated by the following expression (8):

[0127]

[0128] In the above expression (8), except that the sign between the reception power of the macro base station and the reception power of the low-power node is changed from a plus sign to a minus sign, the other signs remain unchanged.

[0129] In the specific calculation, first, the transmit power TxPower (LPN_Data / LPN_CSI) of the low-power node when transmitting a data signal or CSI-RS in the CoMP transmission mode can also be calculated. dB , minus the estimated cooperative downlink path loss of the low-power node To obtain the received power of low-power nodes.

[0130] Furthermore, the reference signal received power of the CRS of the low-power node and the macro base station detected by linear Add the received power of the low-power node to obtain the received power of the macro base station.

[0131] Furthermore, the transmit power TxPower(Macro_CRS) when the macro base station transmits CRS in CoMP transmission mode can be dB , minus the received power of the macro base station to obtain the coordinated downlink path loss of the macro base station

[0132] Finally, according to the reciprocity of uplink and downlink channels, the downlink path loss of the macro base station can be calculated based on the collaborative downlink path loss of the macro base station. To estimate the uplink path loss of the macro base station. For example, referring to the above expressions (2)-(5), the path loss PL is replaced by Similarly, the uplink transmit power value of PUSCH / PUCCH / SRS of closed-loop power control and the uplink transmit power value of open-loop power control can be derived.

[0133] The above expression (8) describes the case where the received power of the macro base station and the received power of the low-power node cancel each other out and the received power of the macro base station is greater than the received power of the low-power node. For the case where the received power of the macro base station and the received power of the low-power node cancel each other out and the received power of the macro base station is not greater than the received power of the low-power node, the uplink path loss can be estimated by the following expression (9):

[0134]

[0135] In the specific calculation, first, the transmit power TxPower (LPN_Data / LPN_CSI) of the low-power node when transmitting a data signal or CSI-RS in the CoMP transmission mode can also be calculated. dB , minus the estimated cooperative downlink path loss of the low-power node To obtain the received power of low-power nodes.

[0136] Furthermore, the received power of the low-power node can be subtracted from the received power of the reference signal of the CRS of the low-power node and the macro base station detected by linear detection. To obtain the received power of the macro base station.

[0137] Furthermore, the transmit power TxPower(Macro_CRS) when the macro base station transmits CRS in CoMP transmission mode can be dB , minus the received power of the macro base station to obtain the coordinated downlink path loss of the macro base station

[0138] Finally, according to the reciprocity of uplink and downlink channels, the downlink path loss of the macro base station can be calculated based on the collaborative downlink path loss of the macro base station. To estimate the uplink path loss of the macro base station. For example, referring to the above expressions (2)-(5), the path loss PL is replaced by Similarly, the uplink transmit power value of PUSCH / PUCCH / SRS of closed-loop power control and the uplink transmit power value of open-loop power control can be derived.

[0139] According to an embodiment of the present disclosure, in a heterogeneous network scenario, when baseband processing is shared between low-power transmitting nodes and macro base stations, when carrier aggregation is performed between base stations, uplink PUCCH / PUSCH transmissions are placed on the low-power transmitting node aggregated carrier as much as possible. If multi-point collaborative transmission is performed between the macro base station node and the low-power node, and uplink data transmission (including PUCCH, PUSCH, SRS, etc.) is required, the path loss of the low-power node on the multi-point transmission frequency band is inferred by referring to the path loss of the low-power node's single transmission carrier, thereby obtaining the path loss compensation value of the uplink power control of the macro base station node and the low-power node, so as to perform more accurate uplink power control.

[0140] Combine the following Figure 6 The wireless communication system according to the embodiment of the present disclosure is described. Figure 6 As shown, the wireless communication system 100 according to an embodiment of the present disclosure includes a macro base station 210, a low power node 220, and a wireless communication device 300. The low power node 220 shares a baseband with the macro base station 210, and the wireless communication device 300 can communicate with the low power node 220 and the macro base station 210 through multiple component carriers.

[0141] The wireless communication device 300 may include a receiving unit 310 , a transmitting unit 320 , a control unit 330 , and the like.

[0142] The receiving unit 310 may be configured to receive downlink signals transmitted by the low power node 220 and the macro base station 210 .

[0143] The transmission unit 320 may be configured to transmit uplink signals to the low-power node 220 and the macro base station 210 .

[0144] The control unit 330 may be configured to control the transmission unit 320 to send all first uplink signals in the uplink signals to the low-power node 220 serving as a receiving node.

[0145] The first uplink signal here may include a PUCCH signal and / or a PUSCH signal.

[0146] Carrier aggregation may be performed between the low power node 220 and the macro base station 210 , and the macro base station 210 may set a downlink component carrier of the macro base station 210 as a downlink primary component carrier.

[0147] In the case where carrier aggregation is performed between the low-power node 220 and the macro base station 210 , the control unit 330 may release the association between the uplink primary component carrier and the downlink primary component carrier.

[0148] In the FDD mode, the control unit 330 may set the uplink component carrier of the low power node 220 as an uplink primary component carrier.

[0149] The wireless communication system 100 may also be a TDD system. In this case, the transmission function of the downlink primary component carrier may be performed by the downlink time slot of the component carrier of the macro base station 210 , and the transmission function of the uplink primary component carrier may be performed by the uplink time slot of the component carrier of the low power node 220 .

[0150] The macro base station 210 may notify the wireless communication device 300 of the uplink primary component carrier on the low power node 220 or restore the association relationship between the uplink primary component carrier and the downlink primary component carrier through RRC, MAC or DCI of the physical layer.

[0151] The receiving unit 310 may receive DCI of the RRC, MAC or physical layer to learn the uplink primary component carrier on the low power node 220. Alternatively, when the wireless communication device 300 aggregates multiple component carriers on the low power node 220 and the macro base station 210 does not operate on these component carriers, the control unit 330 may select the component carrier with the highest or lowest frequency among these component carriers as the uplink primary component carrier on the low power node 220 by default.

[0152] When the carrier aggregation between the low-power node 220 and the macro base station 210 ends, the receiving unit 310 may also receive the DCI of the RRC, MAC or physical layer to learn to restore the association relationship between the uplink primary component carrier and the downlink primary component carrier. Alternatively, the control unit 330 may also restore the association relationship between the uplink primary component carrier and the downlink primary component carrier by default. After restoring the association relationship between the uplink primary component carrier and the downlink primary component carrier, the uplink component carrier of the macro base station 210 may be set as the uplink primary component carrier.

[0153] The macro base station 210 and the low power node 220 may perform coordinated multi-point transmission on the first component carrier, and the low power node 220 may also communicate with the wireless communication device 300 through the second component carrier. In this case, the wireless communication device 300 may further include an estimation unit 340 to estimate the uplink path loss of the uplink signal sent by the wireless communication device 300 using the low power node 220 or the macro base station 210 as the target receiving node, so as to perform uplink signal transmission power compensation.

[0154] Specifically, the estimation unit 340 can be used to estimate the coordinated downlink path loss when the low-power node 220 performs multi-point coordinated transmission for the wireless communication device 300 on the first component carrier with reference to the individual downlink path loss that occurs when the low-power node 220 transmits a downlink signal individually on the second component carrier for the wireless communication device 300. Then, based on the coordinated downlink path loss of the low-power node 220, the estimation unit 340 can also estimate the uplink path loss of the uplink signal sent by the wireless communication device 300 with the low-power node 220 as the target receiving node, so as to perform uplink signal transmission power compensation.

[0155] Further, using the estimation unit 340, the coordinated downlink path loss of the macro base station 210 when performing multi-point coordinated transmission for the wireless communication device 300 on the first component carrier can be estimated based on the coordinated downlink path loss of the low-power node 220. Then, based on the coordinated downlink path loss of the macro base station 210, the estimation unit 340 can also estimate the uplink path loss of the uplink signal sent by the wireless communication device 300 with the macro base station 210 as the target receiving node, so as to perform uplink signal transmission power compensation.

[0156] Various specific implementations of the above-mentioned units of the wireless communication system according to the embodiments of the present disclosure have been described in detail above and will not be repeated here.

[0157] Obviously, each operation process of the method for performing wireless communication in a wireless communication system according to the present disclosure can be implemented in the form of a computer executable program stored in various machine-readable storage media.

[0158] Moreover, the purpose of the present disclosure can also be achieved in the following manner: a storage medium storing the above-mentioned executable program code is directly or indirectly provided to a system or device, and a computer or a central processing unit (CPU) in the system or device reads out and executes the above-mentioned program code. In this case, as long as the system or device has the function of executing the program, the embodiment of the present disclosure is not limited to the program, and the program can also be in any form, for example, a target program, a program executed by an interpreter, or a script program provided to an operating system, etc.

[0159] The above-mentioned machine-readable storage media include, but are not limited to: various memories and storage units, semiconductor devices, disk units such as optical, magnetic and magneto-optical disks, and other media suitable for storing information.

[0160] In addition, the technical solution of the present disclosure can also be implemented by connecting a computer to a corresponding website on the Internet, downloading and installing the computer program code according to the present disclosure into the computer, and then executing the program.

[0161] Figure 7 The present invention is a block diagram of an exemplary structure of a general-purpose personal computer in which the method for wireless communication in a wireless communication system according to an embodiment of the present disclosure can be implemented.

[0162] like Figure 7 As shown, a CPU 1301 performs various processes according to a program stored in a read-only memory (ROM) 1302 or a program loaded from a storage section 1308 to a random access memory (RAM) 1303. In the RAM 1303, data required when the CPU 1301 performs various processes and the like is also stored as needed. The CPU 1301, the ROM 1302, and the RAM 1303 are connected to each other via a bus 1304. An input / output interface 1305 is also connected to the bus 1304.

[0163] The following components are connected to the input / output interface 1305: an input section 1306 (including a keyboard, a mouse, etc.), an output section 1307 (including a display such as a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker, etc.), a storage section 1308 (including a hard disk, etc.), a communication section 1309 (including a network interface card such as a LAN card, a modem, etc.). The communication section 1309 performs communication processing via a network such as the Internet. A drive 1310 may also be connected to the input / output interface 1305 as needed. A removable medium 1311 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc. is installed on the drive 1310 as needed, so that a computer program read therefrom is installed in the storage section 1308 as needed.

[0164] In the case where the above-described series of processing is realized by software, a program constituting the software is installed from a network such as the Internet or a storage medium such as the removable medium 1311 .

[0165] It should be understood by those skilled in the art that such storage media is not limited to Figure 7 The removable medium 1311 shown has a program stored therein and is distributed separately from the device to provide the program to the user. Examples of the removable medium 1311 include magnetic disks (including floppy disks (registered trademark)), optical disks (including compact disk read-only memory (CD-ROM) and digital versatile disks (DVD)), magneto-optical disks (including minidiscs (MD) (registered trademark)), and semiconductor memories. Alternatively, the storage medium may be the ROM 1302, a hard disk included in the storage section 1308, or the like, in which the program is stored and distributed to the user together with the device containing them.

[0166] In the system and method of the present disclosure, it is obvious that each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent schemes of the present disclosure. In addition, the steps of performing the above series of processes can naturally be performed in chronological order according to the order of description, but do not necessarily need to be performed in chronological order. Some steps can be performed in parallel or independently of each other.

[0167] Although the embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings, it should be understood that the embodiments described above are only used to illustrate the present disclosure and do not constitute a limitation of the present disclosure. For those skilled in the art, various modifications and changes can be made to the above embodiments without departing from the essence and scope of the present disclosure. Therefore, the scope of the present disclosure is limited only by the attached claims and their equivalent meanings.

[0168] Regarding the implementation methods including the above embodiments, the following technical solutions are also disclosed:

[0169] Solution 1. A method for wireless communication in a wireless communication system, the wireless communication system comprising a low-power node and a macro base station in a common baseband and a user equipment, the user equipment communicating with the low-power node and the macro base station through multiple component carriers, the method comprising:

[0170] Receiving, by the user equipment, a downlink signal transmitted by the low-power node and the macro base station; and

[0171] transmitting an uplink signal to the low-power node and the macro base station,

[0172] Wherein, the method further comprises:

[0173] The first uplink signal among the uplink signals is all sent to the low-power node serving as a receiving node.

[0174] Solution 2. The method according to Solution 1, wherein the first uplink signal includes a physical uplink control channel (PUCCH) signal and / or a physical uplink shared channel (PUSCH) signal.

[0175] Solution 3. The method according to Solution 1, wherein carrier aggregation is performed between the low-power node and the macro base station, and the macro base station sets the downlink component carrier of the macro base station as a downlink primary component carrier.

[0176] Scheme 4. The method according to Scheme 3 further comprises:

[0177] The association relationship between the uplink primary component carrier and the downlink primary component carrier is released.

[0178] Solution 5. The method according to Solution 4, wherein the wireless communication system is a frequency division duplex (FDD) system, and the method further comprises:

[0179] The uplink component carrier of the low-power node is set as the uplink primary component carrier.

[0180] Solution 6. The method according to Solution 4, wherein the wireless communication system is a time division duplex (TDD) system,

[0181] The transmission function of the downlink primary component carrier is performed by the downlink timeslot of the component carrier of the macro base station; and

[0182] The transmission function of the uplink primary component carrier is performed by the uplink timeslot of the component carrier of the low-power node.

[0183] Scheme 7. The method according to Scheme 4 further comprises:

[0184] The uplink primary component carrier on the low-power node is acquired by receiving downlink control information (DCI) of a radio resource control (RRC), a medium access control (MAC) or a physical layer.

[0185] Solution 8. The method according to Solution 4, wherein, when the user equipment aggregates multiple component carriers on the low-power node and the macro base station does not operate on the multiple component carriers, the method further comprises:

[0186] Acquire an uplink primary component carrier on the low-power node through radio resource control (RRC), medium access control (MAC) or downlink control information (DCI) of a physical layer; or

[0187] A component carrier with the highest or lowest frequency among the multiple component carriers is selected by default as an uplink primary component carrier on the low-power node.

[0188] Solution 9. The method according to Solution 4, wherein when the carrier aggregation between the low-power node and the macro base station ends, the method further comprises:

[0189] Recovering the association relationship between the uplink primary component carrier and the downlink primary component carrier by receiving downlink control information (DCI) of a radio resource control (RRC), a medium access control (MAC) or a physical layer; or

[0190] restoring the association relationship between the uplink primary component carrier and the downlink primary component carrier by default,

[0191] After the association relationship between the uplink primary component carrier and the downlink primary component carrier is restored, the uplink component carrier of the macro base station is set as the uplink primary component carrier.

[0192] Solution 10. The method according to Solution 1, wherein the macro base station and the low-power node perform multi-point coordinated transmission on at least a first component carrier, and the low-power node also communicates with the user equipment through at least a second component carrier.

[0193] Solution 11. The method according to Solution 10 further comprises:

[0194] estimating a first coordinated downlink path loss when the low-power node performs coordinated multi-point transmission for the user equipment on the first component carrier, with reference to a separate downlink path loss that occurs when the low-power node transmits a downlink signal for the user equipment on the second component carrier; and

[0195] Based on the first collaborative downlink path loss, a first uplink path loss of an uplink signal sent by the user equipment on the first component carrier with the low-power node as the target receiving node is estimated to perform uplink signal transmission power compensation.

[0196] Scheme 12. The method according to Scheme 11, wherein:

[0197] The separate downlink path loss is obtained according to the transmit power of the low-power node when transmitting a cell-specific reference signal (CRS) alone and the reference signal received power (RSRP) of the cell-specific reference signal (CRS) of the low-power node detected linearly.

[0198] Solution 13. The method according to solution 11 further comprises:

[0199] estimating, based on the first coordinated downlink path loss, a second coordinated downlink path loss when the macro base station performs coordinated multi-point transmission for the user equipment on the first component carrier; and

[0200] Based on the second coordinated downlink path loss, a second uplink path loss of an uplink signal sent by the user equipment on the first component carrier with the macro base station as a target receiving node is estimated to perform uplink signal transmission power compensation.

[0201] Scheme 14. The method according to Scheme 13, wherein:

[0202] Obtaining a first receiving power according to a transmit power of the low-power node when transmitting a cell-specific reference signal (CRS), data or a channel state information pilot (CSI-RS) for the user equipment in a coordinated multi-point transmission mode on the first component carrier and the first coordinated downlink path loss,

[0203] Obtain a second received power according to the reference signal received power (RSRP) of the cell-specific reference signal (CRS) of the low-power node and the macro base station detected linearly and the first received power, and

[0204] The second coordinated downlink path loss is obtained according to the transmission power of the macro base station when transmitting the cell-specific reference signal (CRS) to the user equipment in a multi-point coordinated transmission mode on the first component carrier and the second receiving power.

[0205] Scheme 15. A method according to Scheme 13, wherein the uplink signal sent by the user equipment with the macro base station as the target receiving node includes a sounding reference signal (SRS).

[0206] Solution 16. A wireless communication device, for communicating with a low-power node and a macro base station in a common baseband through multiple component carriers, the wireless communication device comprising:

[0207] A receiving unit, configured to receive a downlink signal transmitted by the low-power node and the macro base station;

[0208] a transmission unit, configured to transmit an uplink signal to the low-power node and the macro base station; and

[0209] The control unit is used to control the transmission unit to send all first uplink signals in the uplink signals to the low-power node serving as a receiving node.

[0210] Solution 17. A wireless communication device according to Solution 16, wherein the first uplink signal includes a physical uplink control channel (PUCCH) signal and / or a physical uplink shared channel (PUSCH) signal.

[0211] Solution 18. The wireless communication device according to Solution 16, wherein, when carrier aggregation is performed between the low-power node and the macro base station, the control unit releases the association relationship between the uplink primary component carrier and the downlink primary component carrier.

[0212] Solution 19. The wireless communication device according to Solution 18, wherein the control unit sets the uplink component carrier of the low-power node as the uplink primary component carrier.

[0213] Scheme 20. A wireless communication device according to Scheme 18, wherein the receiving unit receives downlink control information (DCI) of a radio resource control (RRC), a medium access control (MAC) or a physical layer to obtain an uplink primary component carrier on the low-power node or to restore the association relationship between the uplink primary component carrier and the downlink primary component carrier.

[0214] Scheme 21. A wireless communication device according to Scheme 18, wherein, when the wireless communication device aggregates multiple component carriers on the low-power node and the macro base station does not operate on the multiple component carriers, the control unit selects the component carrier with the highest or lowest frequency among the multiple component carriers as the uplink main component carrier on the low-power node by default.

[0215] Solution 22. A wireless communication device according to Solution 18, wherein, when the carrier aggregation between the low-power node and the macro base station ends, the control unit restores the association relationship between the uplink primary component carrier and the downlink primary component carrier by default.

[0216] Solution 23. The wireless communication device according to Solution 16, wherein, when the macro base station and the low-power node perform coordinated multi-point transmission on a first component carrier and the low-power node also communicates with the wireless communication device through a second component carrier, the wireless communication device further includes an estimation unit, wherein the estimation unit is configured to:

[0217] estimating a first coordinated downlink path loss when the low-power node performs coordinated multi-point transmission for the wireless communication device on the first component carrier, with reference to a separate downlink path loss generated when the low-power node transmits a downlink signal for the wireless communication device on the second component carrier; and

[0218] Based on the first cooperative downlink path loss, a first uplink path loss of an uplink signal sent by the wireless communication device with the low-power node as a target receiving node is estimated to perform uplink signal transmission power compensation.

[0219] Solution 24. The wireless communication device according to Solution 23, wherein the estimation unit is further configured to:

[0220] estimating, based on the first coordinated downlink path loss, a second coordinated downlink path loss when the macro base station performs coordinated multi-point transmission for the wireless communication device on the first component carrier; and

[0221] Based on the second cooperative downlink path loss, a second uplink path loss of an uplink signal sent by the wireless communication device with the macro base station as a target receiving node is estimated to perform uplink signal transmission power compensation.

[0222] Solution 25. A wireless communication system, comprising:

[0223] Macro base stations;

[0224] a low power node sharing a baseband with the macro base station; and

[0225] According to any one of schemes 16-24, the wireless communication device communicates with the low-power node and the macro base station through multiple component carriers.

[0226] Scheme 26. A wireless communication system according to Scheme 25, wherein the macro base station notifies the wireless communication device of the uplink main component carrier on the low-power node or restores the association relationship between the uplink main component carrier and the downlink main component carrier through radio resource control (RRC), medium access control (MAC) or downlink control information (DCI) of the physical layer.

Claims

1. A wireless communication device, for communicating with a low-power node and a macro base station in a common baseband through multiple component carriers, the wireless communication device comprising: A receiving unit, configured to receive a downlink signal transmitted by the low-power node and the macro base station; A transmission unit, configured to transmit an uplink signal to the low-power node and the macro base station; The wireless communication device communicates with the macro base station through an uplink primary component carrier and a downlink primary component carrier that are associated with each other, and transmits a first uplink signal in the uplink signal only on the uplink primary component carrier of the macro base station by default, wherein the first uplink signal includes a physical uplink control channel PUCCH signal, Wherein, the wireless communication device further includes: a control unit, configured to release the association between the uplink primary component carrier and the downlink primary component carrier when carrier aggregation is performed between the low-power node and the macro base station, so as to control the cancellation of transmitting the first uplink signal only on the uplink primary component carrier of the macro base station, and to set the uplink component carrier of the low-power node as the uplink primary component carrier, so as to perform transmission of the first uplink signal on other component carriers at different frequencies, The receiving unit is further configured to receive radio resource control (RRC) layer signaling from the macro base station to learn how to restore the original association relationship between the uplink primary component carrier and the downlink primary component carrier of the macro base station.

2. The wireless communication device according to claim 1, wherein: The first uplink signal also includes a physical uplink shared channel PUSCH signal.

3. The wireless communication device according to claim 1, wherein: When the wireless communication device aggregates multiple component carriers on the low-power node and the macro base station does not operate on the multiple component carriers, the control unit selects the component carrier with the highest or lowest frequency among the multiple component carriers as the uplink main component carrier on the low-power node by default.

4. The wireless communication device according to claim 1, wherein: When the carrier aggregation between the low-power node and the macro base station ends, the control unit restores the association relationship between the uplink primary component carrier and the downlink primary component carrier by default.

5. The wireless communication device according to claim 1, wherein: In a case where the macro base station and the low-power node perform coordinated multi-point transmission on a first component carrier and the low-power node also communicates with the wireless communication device through a second component carrier, the wireless communication device further includes an estimation unit, wherein the estimation unit is configured to: estimating a first coordinated downlink path loss when the low-power node performs coordinated multi-point transmission for the wireless communication device on the first component carrier, with reference to a separate downlink path loss generated when the low-power node transmits a downlink signal for the wireless communication device on the second component carrier; and Based on the first cooperative downlink path loss, a first uplink path loss of an uplink signal sent by the wireless communication device with the low-power node as a target receiving node is estimated to perform uplink signal transmission power compensation.

6. The wireless communication device according to claim 5, wherein: The estimation unit is further configured to: estimating, based on the first coordinated downlink path loss, a second coordinated downlink path loss when the macro base station performs coordinated multi-point transmission for the wireless communication device on the first component carrier; and Based on the second cooperative downlink path loss, a second uplink path loss of an uplink signal sent by the wireless communication device with the macro base station as a target receiving node is estimated to perform uplink signal transmission power compensation.

7. A method for wireless communication in a wireless communication system, the wireless communication system comprising a low-power node and a macro base station and a user equipment sharing a common baseband, the user equipment communicating with the low-power node and the macro base station via multiple component carriers, the method comprising: Receiving, by the user equipment, a downlink signal transmitted by the low-power node and the macro base station; as well as transmitting an uplink signal to the low-power node and the macro base station, The user equipment communicates with the macro base station through an uplink primary component carrier and a downlink primary component carrier that are associated with each other and transmits a first uplink signal in the uplink signal only on the uplink primary component carrier of the macro base station by default, wherein the first uplink signal includes a physical uplink control channel PUCCH signal, Wherein, the method further comprises: In the case of carrier aggregation between the low-power node and the macro base station, the association relationship between the uplink main component carrier and the downlink main component carrier is released to control the cancellation of the transmission of the first uplink signal only on the uplink main component carrier of the macro base station, and in the case where the wireless communication system is a frequency division duplex FDD system, the uplink component carrier of the low-power node is set to the uplink main component carrier, so as to perform the transmission of the first uplink signal on other component carriers at different frequencies, and The radio resource control RRC layer signaling from the macro base station is also received to learn the restored association relationship between the original uplink primary component carrier and the downlink primary component carrier of the macro base station.

8. The method according to claim 7, wherein: The first uplink signal also includes a physical uplink shared channel PUSCH signal.

9. The method according to claim 7, wherein: The macro base station sets the downlink component carrier of the macro base station as a downlink primary component carrier.

10. The method according to claim 7, wherein: In the case where the wireless communication system is a time division duplex (TDD) system, The transmission function of the downlink primary component carrier is performed by the downlink timeslot of the component carrier of the macro base station; and The transmission function of the uplink primary component carrier is performed by the uplink timeslot of the component carrier of the low-power node.

11. The method according to claim 7, wherein: In a case where the user equipment aggregates multiple component carriers on the low power node and the macro base station does not operate on the multiple component carriers, the method further comprises: A component carrier with the highest or lowest frequency among the multiple component carriers is selected by default as an uplink primary component carrier on the low-power node.

12. The method according to claim 7, wherein: When the carrier aggregation between the low power node and the macro base station ends, the method further includes: restoring the association relationship between the uplink primary component carrier and the downlink primary component carrier by default, After the association relationship between the uplink primary component carrier and the downlink primary component carrier is restored, the uplink component carrier of the macro base station is set as the uplink primary component carrier.

13. The method according to claim 7, wherein: The macro base station and the low-power node perform coordinated multi-point transmission on at least a first component carrier, and the low-power node also communicates with the user equipment through at least a second component carrier.

14. The method according to claim 13, further comprising: estimating a first coordinated downlink path loss when the low-power node performs coordinated multi-point transmission for the user equipment on the first component carrier, with reference to a separate downlink path loss that occurs when the low-power node transmits a downlink signal for the user equipment on the second component carrier; and Based on the first collaborative downlink path loss, a first uplink path loss of an uplink signal sent by the user equipment on the first component carrier with the low-power node as the target receiving node is estimated to perform uplink signal transmission power compensation.

15. The method according to claim 14, wherein: The separate downlink path loss is obtained according to the transmit power when the low-power node transmits the cell-specific reference signal CRS alone and the reference signal received power RSRP of the cell-specific reference signal CRS of the low-power node detected linearly.

16. The method according to claim 14, further comprising: estimating, based on the first coordinated downlink path loss, a second coordinated downlink path loss when the macro base station performs multi-point coordinated transmission for the user equipment on the first component carrier; as well as Based on the second coordinated downlink path loss, a second uplink path loss of an uplink signal sent by the user equipment on the first component carrier with the macro base station as a target receiving node is estimated to perform uplink signal transmission power compensation.

17. The method according to claim 16, wherein: A first receiving power is obtained according to a transmit power when the low-power node transmits a cell-specific reference signal CRS, data or a channel state information pilot CSI-RS for the user equipment in a coordinated multi-point transmission mode on the first component carrier and the first coordinated downlink path loss, According to the linearly detected reference signal received power RSRP of the cell-specific reference signal CRS of the low-power node and the macro base station and the first received power, a second received power is obtained, and The second coordinated downlink path loss is obtained according to the transmission power of the macro base station when transmitting the cell-specific reference signal CRS to the user equipment in a coordinated multi-point transmission mode on the first component carrier and the second receiving power.

18. The method according to claim 16, wherein: The uplink signal sent by the user equipment using the macro base station as a target receiving node includes a sounding reference signal SRS.

19. A wireless communication system, comprising: Macro base stations; A low-power node, which shares a baseband with the macro base station; as well as The wireless communication device according to any one of claims 1 to 6, wherein the device communicates with the low power node and the macro base station through multiple component carriers.

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