Method for controlling the transmission power of a mobile station

Abstract

Methods and apparatus for controlling transmit power of a mobile station are disclosed. A mobile station in direct communication over a cross link (XL) receives control parameters from a base station. A first mobile station (receiving mobile station) can calculate a correction parameter for power compensation of transmissions from a second mobile station (transmitting mobile station) to the first mobile station and send the correction parameter to the second mobile station. The correction parameter can be generated and located within a maximum limit and a minimum limit. The second mobile station can calculate a transmit power level for transmissions to the first mobile station based on the correction parameter, a measurement of resources allocated to the cross link for mobile station to mobile station direct communication, an interference measurement received from the first mobile station, and a path loss to the first mobile station.

Description

[0001] This application is a divisional application of Chinese Patent Application No. 201810153879.1, filed on June 12, 2012, entitled "Method for Controlling the Transmission Power of a Mobile Station".

[0002] Cross-references to related applications

[0003] This application claims the benefit of U.S. Provisional Patent Application No. 61 / 496,158, filed June 13, 2011, and U.S. Provisional Patent Application No. 61 / 527,749, filed August 26, 2011, the contents of which are incorporated herein by reference. Background Technology

[0004] Standards setting organizations have recently begun considering non-traditional applications of cellular networks, involving communications that are not initiated by humans and / or do not strictly adhere to hierarchical topologies. Research / work projects have been initiated within the European Telecommunications Standards Institute / 3GPP (ETSI / 3GPP) and IEEE 802.16, considering machine-to-machine (M2M) communication or machine-type communication (MTC). M2M and MTC are defined as machine-initiated communications for communication with other machines or with humans. Furthermore, IEEE 802.16, under the 802.16n initiative, has begun researching and specifying new network topologies, including mobile station-to-mobile direct communication (also known as peer-to-peer communication), which can be used for coverage extension and / or throughput improvement. Summary of the Invention

[0005] A method and apparatus for controlling the transmit power of a mobile station are disclosed. A mobile station communicating directly on a cross-link (XL) receives control parameters from a base station. A first mobile station (receiving mobile station) can calculate correction parameters for power compensation of transmissions from a second mobile station (transmitting mobile station) to the first mobile station and send these correction parameters to the second mobile station. The correction parameters can be generated and are within maximum and minimum limits configured by the base station. The second mobile station can calculate the transmit power level for transmissions to the first mobile station based on these correction parameters, its own measurements of resources allocated to the cross-link for mobile station-to-mobile station direct communication, interference measurements received from the first mobile station, path loss to the first mobile station, etc. Attached Figure Description

[0006] A more detailed understanding can be obtained from the following description, which is given in conjunction with the accompanying drawings and examples, wherein:

[0007] Figure 1AThis is a system illustration of an exemplary communication system that can implement one or more of the disclosed embodiments;

[0008] Figure 1B It is possible Figure 1A A system diagram illustrating an exemplary wireless transmit / receive unit (WTRU) used within a communication system;

[0009] Figure 1C It is possible Figure 1A A system diagram illustrating an exemplary radio access network and an exemplary core network used within a communication system;

[0010] Figure 2 An exemplary case of a mobile station communicating directly on an XL is shown, wherein at least one of the mobile stations communicating directly is under the control of a base station.

[0011] Figure 3 This is a flowchart of a process for transmit power control at a mobile station according to one embodiment;

[0012] Figure 4 Interference caused by uplink (UL) transmissions is shown, where XL transmissions occur only within the UL area; and

[0013] Figure 5 (A)-5(F) illustrate exemplary interference mechanisms in cases where XL transmissions occur in the UL and downlink (DL) zones. Detailed Implementation

[0014] Figure 1A This is an illustration of an exemplary communication system 100 that can implement one or more of the disclosed embodiments. The communication system 100 can be a multi-access system that provides content such as voice, data, video, messaging, and broadcasting to multiple wireless users. The communication system 100 enables multiple wireless users to access this content through the sharing of system resources, including wireless bandwidth. For example, the communication system 100 can use one or more channel access methods, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal FDMA (OFDMA), Single Carrier FDMA (SC-FDMA), etc.

[0015] like Figure 1AAs shown, the communication system 100 may include wireless transmit / receive units (WTRUs) 102a, 102b, 102c, 102d, a radio access network (RAN) 104, a core network 106, a public switched telephone network (PSTN) 108, the Internet 110, and other networks 112. However, it should be understood that the disclosed embodiments accommodate any number of WTRUs, base stations, networks, and / or network elements. Each of the WTRUs 102a, 102b, 102c, 102d can be any type of device configured to operate and / or communicate in a wireless environment. For example, WTRUs 102a, 102b, 102c, 102d may be configured to transmit and / or receive wireless signals and may include user equipment (UE), mobile stations, fixed or mobile subscriber units or stations, pagers, cellular phones, personal digital assistants (PDAs), smartphones, laptops, netbooks, personal computers, wireless sensors, consumer electronics, and so on.

[0016] The communication system 100 may also include base stations 114a and 114b. Each of base stations 114a and 114b may be any type of device configured to interface wirelessly with at least one of the WTRUs 102a, 102b, 102c, and 102d to facilitate access to one or more communication networks (e.g., core network 106, Internet 110, and / or network 112). For example, base stations 114a and 114b may be base transceiver stations (BTS), node B, e-node B, home node B, home e-node B, site controllers, access points (APs), wireless routers, etc. Although base stations 114a and 114b are each described as a single element, it should be understood that base stations 114a and 114b may include any number of interconnected base stations and / or network elements.

[0017] Base station 114a may be part of RAN 104, which may also include other base stations and / or network elements (not shown), such as base station controllers (BSCs), radio network controllers (RNCs), relay nodes, etc. Base station 114a and / or base station 114b may be configured to transmit and / or receive radio signals within a specific geographical area referred to as a cell (not shown). The cell may also be divided into cell sectors. For example, the cell associated with base station 114a may be divided into three sectors. Thus, in one embodiment, base station 114a may include three transceivers, meaning that each sector of the cell has one transceiver. In another embodiment, base station 114a may use multiple-input multiple-output (MIMO) technology, and thereby multiple transceivers may be used for each sector in the cell.

[0018] Base stations 114a and 114b can communicate with one or more of WTRUs 102a, 102b, 102c, and 102d via air interface 116, where the air interface can be any suitable wireless communication link (e.g., radio frequency (RF), microwave, infrared (IR), ultraviolet (UV), visible light, etc.). The air interface 116 can be established using any suitable radio access technology (RAT).

[0019] More specifically, as described above, the communication system 100 can be a multi-access system and can use one or more channel access schemes, such as CDMA, TDMA, FDMA, OFDMA, SC-FDMA, etc. For example, base stations 114a and WTRUs 102a, 102b, and 102c in RAN 104 can implement radio technologies such as Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access (UTRA), which can use Wideband CDMA (WCDMA) to establish the air interface 116. WCDMA can include communication protocols such as High-Speed ​​Packet Access (HSPA) and / or Evolved HSPA (HSPA+). HSPA can include High-Speed ​​Downlink Packet Access (HSDPA) and / or High-Speed ​​Uplink Packet Access (HSUPA).

[0020] In another embodiment, base station 114a and WTRUs 102a, 102b, 102c may implement radio technologies such as Evolved UMTS Terrestrial Radio Access (E-UTRA), which may use Long Term Evolution (LTE) and / or LTE-Advanced (LTE-A) to establish air interface 116.

[0021] In other implementations, base station 114a and WTRUs 102a, 102b, 102c may implement radio technologies such as IEEE 802.16 (i.e., Global Microwave Access Interoperability (WiMAX)), CDMA2000, CDMA2000 1X, CDMA2000EV-DO, Interim Standard 2000 (IS-2000), Interim Standard 95 (IS-95), Interim Standard 856 (IS-856), Global System for Mobile Communications (GSM), Enhanced Data Rate for GSM Evolution (EDGE), GSM EDGE (GERAN), etc.

[0022] Figure 1ABase station 114b can be, for example, a wireless router, home node B, home e node B, or access point, and can use any suitable RAT to facilitate wireless connectivity in a local area (such as a business premises, residence, vehicle, campus, etc.). In one embodiment, base station 114b and WTRUs 102c, 102d can implement radio technologies such as IEEE 802.11 to establish a wireless local area network (WLAN). In another embodiment, base station 114b and WTRUs 102c, 102d can implement radio technologies such as IEEE 802.15 to establish a wireless personal area network (WPAN). In yet another embodiment, base station 114b and WTRUs 102c, 102d can use cellular-based RATs (e.g., WCDMA, CDMA2000, GSM, LTE, LTE-A, etc.) to establish picocells or femtocells. Figure 1A As shown, base station 114b can have a direct connection to the Internet 110. Therefore, base station 114b can access the Internet 110 without going through core network 106.

[0023] RAN 104 can communicate with core network 106, which can be any type of network configured to provide voice, data, application, and / or Voice over Internet Protocol (VoIP) services to one or more WTRUs among WTRUs 102a, 102b, 102c, and 102d. For example, core network 106 can provide call control, billing services, location-based services, prepaid calling, internet connectivity, video distribution, and / or perform advanced security functions such as user authentication. Although not in... Figure 1A As shown, but it should be understood that RAN 104 and / or core network 106 can communicate directly or indirectly with other RANs that use the same RAT as RAN 104 or a different RAT. For example, in addition to connecting with RAN 104 which can use E-UTRA radio technology, core network 106 can also communicate with another RAN (not shown) that uses GSM radio technology.

[0024] Core network 106 can also act as a gateway for WTRUs 102a, 102b, 102c, and 102d to access PSTN 108, the Internet 110, and / or other networks 112. PSTN 108 may include a circuit-switched telephone network providing Common Old-Style Telephone Service (POTS). The Internet 110 may include a globally interconnected computer network and equipment system using common communication protocols, such as Transmission Control Protocol (TCP), User Datagram Protocol (UDP), and Internet Protocol (IP) from the TCP / IP Internet Protocol suite. Network 112 may include wired or wireless communication networks owned and / or operated by other service providers. For example, network 112 may include another core network connected to one or more RANs, which may use the same RAT as RAN 104 or a different RAT.

[0025] Some or all of the WTRUs 102a, 102b, 102c, and 102d in the communication system 100 may include multi-mode capability; that is, WTRUs 102a, 102b, 102c, and 102d may include multiple transceivers communicating with different wireless networks on different wireless links. For example, Figure 1A The WTRU 102c shown can be configured to communicate with base station 114a, which can use cellular-based radio technology, and with base station 114b, which can use IEEE 802 radio technology.

[0026] Figure 1B This is a system diagram of an exemplary WTRU 102 (i.e., a mobile station (MS) or subscriber station (SS)). Figure 1B As shown, WTRU 102 may include a processor 118, a transceiver 120, a transmitting / receiving element 122, a speaker / microphone 124, a keyboard 126, a display / touchpad 128, non-removable memory 106, removable memory 132, a power supply 134, a Global Positioning System (GPS) chipset 136, and other peripheral devices 138. It should be understood that WTRU 102 may include any sub-combination of the foregoing elements while remaining consistent with the implementation.

[0027] Processor 118 can be a general-purpose processor, a special-purpose processor, a conventional processor, a digital signal processor (DSP), multiple microprocessors, one or more microprocessors associated with a DSP core, a controller, a microcontroller, an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) circuit, any other type of integrated circuit (IC), a state machine, etc. Processor 118 can perform signal encoding, data processing, power control, input / output processing, and / or any other function that enables WTRU 102 to operate in a wireless environment. Processor 118 can be coupled to transceiver 120, which can be coupled to transmitting / receiving element 122. Although Figure 1B While the processor 118 and transceiver 120 are described as separate components, it should be understood that the processor 118 and transceiver 120 can be integrated together in an electronic package or chip.

[0028] Transmitting / receiving element 122 can be configured to transmit signals to or receive signals from a base station (e.g., base station 114a) via air interface 116. For example, in one embodiment, transmitting / receiving element 122 can be an antenna configured to transmit and / or receive RF signals. In another embodiment, transmitting / receiving element 122 can be a transmitter / detector configured to transmit and / or receive signals such as IR, UV, or visible light signals. In yet another embodiment, transmitting / receiving element 122 can be configured to transmit and receive both RF and optical signals. It should be understood that transmitting / receiving element 122 can be configured to transmit and / or receive any combination of wireless signals.

[0029] In addition, although Figure 1B While the transmitting / receiving element 122 is described as a single element, the WTRU 102 may include any number of transmitting / receiving elements 122. More specifically, the WTRU 102 may use MIMO technology. Therefore, in one embodiment, the WTRU 102 may include two or more transmitting / receiving elements 122 (e.g., multiple antennas) for transmitting and receiving wireless signals via the air interface 116.

[0030] Transceiver 120 can be configured to modulate the signal to be transmitted by transmitting / receiving element 122 and demodulate the signal received by transmitting / receiving element 122. As described above, WTRU 102 can have multimode capability. Thus, transceiver 120 can include multiple transceivers that allow WTRU 102 to communicate via various RATs such as UTRA and IEEE 802.11.

[0031] The processor 118 of WTRU 102 can be coupled to and receive user input data from devices such as a speaker / microphone 124, a keyboard 126, and / or a display / touchpad 128 (e.g., a liquid crystal display (LCD) unit or an organic light-emitting diode (OLED) display unit). The processor 118 can also output user data to the speaker / microphone 124, keyboard 126, and / or display / touchpad 128. Furthermore, the processor 118 can access and store information from any suitable memory (e.g., non-removable memory 130 and / or removable memory 132). The non-removable memory 130 may include random access memory (RAM), read-only memory (ROM), a hard disk, or any other type of memory storage device. The removable memory 132 may include a SIM card, a memory stick, a secure digital storage (SD) card, etc. In other embodiments, processor 118 may access information from and store data in memories that are not physically located on WTRU 102 (e.g., memories located on a server or home computer (not shown)).

[0032] The processor 118 can receive power from the power supply 134 and can be configured to distribute and / or control power to other components in the WTRU 102. The power supply 134 can be any suitable device that powers the WTRU 102. For example, the power supply 134 may include one or more dry cell batteries (e.g., nickel-cadmium (NiCd), nickel-zinc (NiZn), nickel-metal hydride (NiMH), lithium-ion (Li-ion), etc.), solar cells, fuel cells, etc.

[0033] The processor 118 may also be coupled to a GPS chipset 136, which may be configured to provide location information (e.g., longitude and latitude) related to the current location of the WTRU 102. As a supplement or replacement to the information from the GPS chipset 136, the WTRU 102 may receive location information from base stations (e.g., base stations 114a, 114b) via the air interface 116, and / or determine its location based on the timing of signals received from two or more nearby base stations. It should be understood that, while remaining consistent with the implementation, the WTRU 102 may acquire location information using any suitable location determination method.

[0034] The processor 118 may also be coupled to other peripheral devices 138, which may include one or more software and / or hardware modules providing additional features, functions, and / or wired or wireless connectivity. For example, peripheral devices 138 may include accelerometers, electronic compasses, satellite transceivers, digital cameras (for photos and videos), Universal Serial Bus (USB) ports, vibration devices, television transceivers, hands-free headsets, etc. Modules, FM radio units, digital music players, media players, video game player modules, internet browsers, etc.

[0035] Figure 1C This is a system diagram of RAN 104 and core network 106 according to one embodiment. RAN 104 may be an access service network (ASN) that communicates with WTRUs 102a, 102b, and 102c via air interface 116 using IEEE 802.16 radio technology. As will be discussed further below, communication links between different functional entities of WTRUs 102a, 102b, 102c, RAN 104, and core network 106 can be defined as reference points.

[0036] like Figure 1C As shown, RAN 104 may include base stations 140a, 140b, 140c and ASN gateway 142. However, it should be understood that RAN 104 may include any number of base stations and ASN gateways while maintaining compliance with the implementation. Base stations 140a, 140b, and 140c may each be associated with a specific cell (not shown) in RAN 104 and may each include one or more transceivers for communicating with WTRUs 102a, 102b, and 102c via air interface 116. In one implementation, base stations 140a, 140b, and 140c may implement MIMO technology. Therefore, base station 140a may, for example, use multiple antennas to transmit radio signals to and receive radio signals from WTRU 102a. Base stations 140a, 140b, and 140c may also provide mobility management functions such as handover triggering, tunnel establishment, radio resource management, service classification, Quality of Service (QoS) policy enhancement, etc. ASN Gateway 142 can act as a service aggregation point and can be responsible for paging, caching user profiles, routing to the core network 106, etc.

[0037] The air interface 116 between WTRUs 102a, 102b, and 102c and RAN 104 can be defined as an R1 reference point, which implements the IEEE 802.16 standard. Furthermore, each of WTRUs 102a, 102b, and 102c can establish a logical interface (not shown) with the core network 106. The logical interface between WTRUs 102a, 102b, and 102c and the core network 106 can be defined as an R2 reference point, which can be used for authentication, authorization, IP host configuration management, and / or mobility management.

[0038] The communication link between each of base stations 140a, 140b, and 140c can be defined as an R8 reference point, which includes protocols facilitating WTRU handover and data transmission between base stations. The communication link between base stations 140a, 140b, and 140c and ASN gateway 215 can be defined as an R6 reference point. This R6 reference point may include protocols for facilitating mobility management based on mobility events associated with each of WTRUs 102a, 102b, and 102c.

[0039] like Figure 1C As shown, RAN 104 can be connected to core network 106. The communication link between RAN 104 and core network 106 can be defined as an R3 reference point, which includes, for example, protocols facilitating data transmission and mobility management capabilities. Core network 106 may include a Mobile IP Home Agent (MIP-HA) 144, an Authentication, Authorization, and Accounting (AAA) server 146, and a gateway 148. While each of the foregoing elements is described as part of core network 106, it should be understood that any of these elements may be owned and / or operated by an entity other than the core network operator.

[0040] MIP-HA manages IP addresses and enables WTRU 102a, 102b, and 102c to roam between different ASNs and / or different core networks. MIP-HA 144 provides WTRU 102a, 102b, and 102c with access to packet-switched networks such as the Internet, facilitating communication between WTRU 102a, 102b, and 102c and IP-enabled devices. AAA server 146 handles user authentication and user support services. Gateway 148 facilitates interoperability with other networks. For example, gateway 148 provides WTRU 102a, 102b, and 102c with access to circuit-switched networks such as the PSTN, facilitating communication between WTRU 102a, 102b, and 102c and traditional landline communication equipment. In addition, gateway 148 can provide access to network 112 to WTRUs 102a, 102b, and 102c, wherein network 112 may include other wired or wireless networks owned and / or operated by other service providers.

[0041] Although not in Figure 1C As shown, but it should be understood that RAN 104 can be connected to other ASNs, and core network 106 can be connected to other core networks. The communication link between RAN 104 and other ASNs can be defined as an R4 reference point, which may include protocols for coordinating the mobility of WTRUs 102a, 102b, and 102c between RAN 104 and other ASNs. The communication link between core network 106 and other core networks can be defined as an R5 reference, which may include protocols for facilitating interoperability between the home core network and the visited core network.

[0042] A subscriber station (SS) or mobile station (MS) is a non-infrastructure node (infrastructure nodes are such as base stations (BS) or relays). The terms SS and MS will be used interchangeably. A peer-to-peer subscriber station (PSS) is the SS or MS involved in peer-to-peer communication. A terminal PSS (TPSS) is a PSS assisted by a forwarding PSS (FPSS). An FPSS is a PSS that forwards data between a TPSS and the infrastructure node used for that TPSS. A cross-link (XL) is a link between two subscriber stations. A traditional link (TRL) is a link between an SS and an infrastructure node.

[0043] Figure 2An exemplary configuration of mobile stations 220, 230, 240, and 250 communicating directly on an XL is shown, with at least one of the mobile stations communicating directly under the control of a BS 210. One MS (MS 220 in this example) may be attached to the BS 210, while other MSs (MS 230 in this example) may not be attached to the BS 210. In this case, MS 230 transmits to and receives from MS 220, and MS 220 may function as a relay (i.e., MS forwarding / relay) of MS 230. Alternatively, both mobile stations 240 and 250 communicating directly may be attached to the BS 210 and may transmit to and receive from the BS 210 on a TRL.

[0044] MS forwarding (relay) is used for coverage extension, where an MS (e.g., FPSS) is referred to as an FPSS. Figure 2 MS 220 in the middle) forwards to / from MSs called TPSS (e.g. Figure 2 The data includes MS 230 (in the network) and network data. At least the FPSS must be within the coverage area of ​​an infrastructure node (e.g., a BS or relay) and attached to that infrastructure node. The data rates that can be supported between the TPSS and FPSS, and between the FPSS and the infrastructure node, can be significantly higher than the data rates that can be supported between the TPSS and the infrastructure node.

[0045] MS direct communication can be used for throughput enhancement, where two mobile stations act as a data source and a data sink. At least one mobile station can be within the coverage area of ​​an infrastructure node and can be attached to that infrastructure node. When both mobile stations are attached, direct communication can be used when the data rate between the mobile stations is significantly higher than the data rate from the MS to the BS, or when doing so would increase cell throughput.

[0046] Higher cell throughput can be achieved when resources (e.g., time and frequency resources in Orthogonal Frequency Division Multiple Access (OFDMA)) are reused throughout the cell. Achieving higher throughput relies on perceived link spatial separation, which is maximized when XL transmission power is reduced. On the other hand, using too low a transmission power will increase the error rate and thus increase interference by increasing the number of retransmissions. An optimal point can exist, and the task of the power control process is to maintain the transmission level at or around this optimal point. The direction of both XL and TRL can be power-controlled.

[0047] The transmit power of an MS can be controlled, in whole or in part, by a BS. The BS maintains overall cell performance by controlling transmit power and interference. The BS can instruct transmitting and receiving MSs on the XL and TRL, as well as mobile stations or other base stations, to report measurements and perform transmit power control based on those measurements. These measurements include, but are not limited to, measurements determining link success (e.g., packet error rate and Hybrid Automatic Repeat Request (HARQ) residuals), measurements determining the level of a specific signal received on a specific resource, measurements determining the level of interference on a specific resource, measurements obtained by other base stations in other cells, and so on.

[0048] The embodiments disclosed herein can be applied to relay (MS forwarding) and MS-to-MS direct communication, as well as TRL transmission. It should be noted that the embodiments will be explained with reference to IEEE 802.16-2009 or 802.16.1, but the embodiments can be applied to any wireless communication system, including but not limited to WCDMA, LTE, CDMA2000, etc.

[0049] IEEE 802.16.1 specifies the power control formula for uplink transmission. The transmitting MS calculates the power for each subcarrier and each stream according to the following equation:

[0050] P = L + SINR 目标 +NI+Offset equation (1)

[0051] Where P is the transmit power level (dBm) for each stream and each subcarrier, L is the estimated average DL propagation loss calculated by the MS, and SINR is... 目标 is the target uplink signal-to-interference-noise ratio (SINR) required at the BS, NI is the estimated average power level of noise and interference for each subcarrier at the BS, which is broadcast by the BS, and Offset is a correction factor for MS-specific power compensation, which is controlled by the BS via power control messages.

[0052] For data channels that include data channels used for MAC frames, the transmitting MS calculates the target SINR as follows:

[0053]

[0054] Among them, SINR 最小 (dB) is the SINR requirement (i.e., dataSinrMin) expected by BS for the minimum rate, γIoT is the fairness and interference over thermal (IoT) control factor for broadcasting, and SIR is... DLThis is a linear ratio of the downlink signal-to-interference ratio (SIR), which is measured by the MS on the DL resources used by the serving BS. α is a factor dependent on the number of receiving antennas at the receiving MS, β is set to 1 to account for the number of flows, otherwise it is set to 0, and TNS is the total number of flows. In the case of multi-user MIMO (MU-MIMO), TNS represents the number of aggregated flows.

[0055] In equation (2), the target SINR is determined by the transmitting MS based on the DL SIR, the minimum SINR, correction parameters related to the number of streams and the number of receiving antennas at the BS, and a correction factor that takes into account inter-cell interference.

[0056] For the control channel, SINR 目标 Control channels can be signaled from the BS for each type. Examples of control channels are HARQ feedback, synchronous ranging, primary feedback channels and secondary feedback channels, and bandwidth request channels. For control channels, the Offset in equation (1) is set to Offset. 控制 Furthermore, the BS can change the offset by sending physical layer messages (PC-A-MAP). 控制 The value of the Offset 控制 MS shall make the following adjustments:

[0057] Offset 控制 =Offset 控制 +Δ 功率调整 Equation (3)

[0058] IEEE 802.16-2009 specifies closed-loop and open-loop power control procedures. For closed-loop power control, when the coding rate changes or is indicated to do so by the BS using a Fast Power Control (FPC) MAC control message, the power is updated as follows:

[0059] P 新 =P 最近 +(C / N 新 –C / N 最近 )–(10log 10 (R 新 -10log 10 (R 最近 Equation (4) + Offset

[0060] Among them, P 新 It is the power of the new UL burst in the current UL frame, C / N 新 It is the normalized C / N, R of the new UL burst in the current UL frame. 新 It is the repetition factor R, P of the new UL burst in the current UL frame.最近 It is the most recently transmitted UL frame that has (C / N – 10log) 10 The maximum burst power of (R)), C / N 最近 Is with P 最近 The associated normalized C / N (therefore involving the most recently transmitted UL frame with (C / N – 10log) 10 (R)) the burst of the maximum value, R 最近 Is with P 最近 The associated repetition factor R (therefore involves the most recently transmitted UL frame with (C / N – 10log) 10 (R) is the burst of the maximum value, and Offset is the accumulation of the power correction term sent by the BS from the last transmission.

[0061] The formula used for open-loop power control is as follows:

[0062] P = L + C / N + NI - 10log 10 (R)+Offset_SS perSS +Offset_BS perSS Equation (5)

[0063] Where P is the TX power level (dBm) for each subcarrier used in the current transmission, which includes the MSTx antenna gain; L is the estimated average current UL propagation loss, including the MSTx antenna gain and path loss but excluding the BS Rx antenna gain; C / N is the normalized C / N of the modulation and forward error correction (FEC) rate for the current transmission; R is the number of repetitions of the modulation / FEC rate; NI is the estimated average power level (dBm) of noise and interference for each subcarrier at BS, which does not include the BS Rx antenna gain; and Offset_SS perSS This is a correction term for SS-specific power compensation, controlled by SS and initialized to zero, along with Offset_BS. perSS This is a correction term for power compensation specific to the SS, controlled by the BS using power control messages. When Offset_BS perSS When setting via the PMC_RSP message, it includes the BS Rx antenna gain. Note that the process uses average path loss, not instantaneous path loss.

[0064] An implementation of transmit power control for a transmitting MS is disclosed, wherein the transmitting MS transmits data or control signals on an XL to another MS (receiving MS) or on a TRL to a BS.

[0065] The transmitting MS calculates the transmit power level according to equations (1)-(5) or modifications thereof. The transmitting MS calculates the path loss (propagation loss) based on the power level received from the receiving node (MS or infrastructure node). The average path loss estimate, rather than the instantaneous path loss estimate, can be calculated and used to calculate the transmit power level. Fast fading can be handled by modifying the coding and / or modulation parameters.

[0066] The receiving MS can transmit a reference signal (e.g., a beacon, pilot, preamble, etc.) to the transmitting MS at a known power level. This reference signal is identifiable to the specific MS (i.e., the receiving MS). An 802.16.1 Auxiliary High-Level Preamble (SA-Preamble) can be used. The power level is known, or is known to the transmitting MS, or to the entity issuing power control commands to the transmitting MS.

[0067] Power control parameters (e.g., correction terms for MS-specific power compensation, such as Offset in Equation (1)) can be generated by the BS and transmitted directly or indirectly to the transmitting MS (i.e., via another MS in both MS-to-MS direct communication and MS-to-MS forwarding scenarios) to provide correction for the transmit power level. Some control parameters can be broadcast.

[0068] Alternatively, power control parameters (e.g., correction terms for MS-specific power compensation, such as Offset in Equation (1)) can be generated by the receiving MS and signaled to the transmitting MS. The receiving MS can generate compensation parameters based on its own reception from the transmitting MS and parameters configured by the BS. Alternatively, the receiving MS can generate compensation parameters based on its own reception from the transmitting MS, without being controlled by the base station. The receiving MS can be allowed to change the compensation parameters between configured minimum and maximum values ​​(Offset_min and Offset_max). The values ​​of Offset_min and Offset_max can be determined by the BS and forwarded to the receiving MS (directly or via another MS). Initial values ​​can be transmitted during the initial MS-to-MS association.

[0069] Alternatively, the receiving MS may be allowed to change the compensation parameter within a configured range (e.g., a range given by the maximum value of + / - Offset_change_range) based on the last value used at a given time. In this case, the given time may be predefined or announced by the BS via signaling.

[0070] Alternatively, the compensation parameter can be defined as the sum of the portion determined by BS and the portion determined by MS, as follows:

[0071] Offset=Offset_m+Offset_b equation (6)

[0072] Here, Offset_m is determined by the MS, for example, based on the average packet error rate, and Offset_b is determined by the BS, for example, to control cell interference. Offset_b can be transmitted from the BS. This substitution can be combined with any of the substitution implementations above.

[0073] If the range limits in the three embodiments described above need to be exceeded, the receiving MS can send a message to the BS (either directly or via another MS) requesting changes to these limits.

[0074] Alternatively, the receiving MS can generate unrestricted compensation parameters and transmit them to the transmitting MS, and the compensation values ​​can then be clipped to the minimum or maximum values ​​at the transmitting MS.

[0075] XL may fail for any reason, such as insufficient power due to pruning of compensation parameters. XL can be monitored and any failure of XL can be reported to BS, which can then adjust the value.

[0076] Figure 3 This is a flowchart of a process 300 for transmit power control at a mobile station according to one embodiment. The transmitting MS and receiving MS receive control parameters (302) from the base station. These control parameters can be transmitted to the mobile station directly or via another MS.

[0077] The transmitting MS receives from the receiving MS a power compensation correction parameter (304) for the transmission to the receiving MS. The receiving MS calculates the power compensation correction parameter for the transmission from the transmitting MS to the receiving MS based on the data received on the XL. This correction parameter can be generated and is within the maximum and minimum limits configured by the base station.

[0078] The transmitting MS can perform measurements on the resources allocated to the cross-links used for direct mobile station-to-mobile station communication (306). The transmitting MS can receive interference measurements (e.g., IoT values) from the receiving MS (308). The transmitting MS can calculate the path loss to the receiving MS based on a reference signal transmitted by the receiving MS (310).

[0079] The transmitting MS can calculate the transmit power level (312) for transmission to the receiving MS based on the correction parameters, its own measurements, interference measurements from the receiving MS, and path loss. The transmitting MS transmits data to the receiving MS based on this transmit power level (314).

[0080] When operating in Frequency Division Duplex (FDD), XL transmissions between mobile stations can occur only in the UL band, only in the DL band, or both the UL and DL bands. When operating in Time Division Duplex (TDD), XL transmissions between mobile stations can occur only in the UL area, only in the DL area, or both the UL and DL areas. The UL area is a resource configured for UL transmissions, while the DL area is a resource configured for DL ​​transmissions. For example, in the case of MS forwarding, FPSS transmissions can occur in the DL area (DL band in FDD) in TDD, and TPSS transmissions can occur in the UL area (UL band in FDD) in TDD. In the case of MS-to-MS direct communication, an MS attached to a BS (or, in the case of both being attached to a BS, an MS with a better path to the BS) can transmit in the DL area (DL band in FDD) in TDD, and another can transmit in the UL area (UL band in FDD) in TDD. At least one of the mobile stations involved in direct communication on XL can be attached to a BS. It should be understood that the power control process according to the embodiments described herein is independent of duplex mode and can be applied equally to both FDD and TDD, i.e., in the UL band (FDD) or UL zone (TDD), or in the DL band (FDD) or DL ​​zone (TDD). The embodiments will be described with reference to the UL and DL zones used for TDD operation, but they can also be applied to FDD operation.

[0081] When XL transmissions occur only in UL zones, TRL UL transmissions can cause interference to another TRL UL transmission at the BS (between cells or within a cell in MU-MIMO) or to the receiving MS's XL transmission, and XL transmissions can cause interference to the TRL UL transmission at the BS or to the receiving MS's XL transmission.

[0082] Figure 4 Interference caused by UL transmissions is shown, where XL transmissions occur only within the UL zone. Figure 4 In the diagram, solid lines represent TRL or XL transmissions, and dashed lines represent interference caused by TRL or XL transmissions. Figure 4In this configuration, MS 401 and MS 402 communicate on the XL, simultaneously under the control of BS 410. MS 404 forwards data from MS 405 to BS 410. MS 406 and MS 407 also communicate on the XL. MS 405, 406, and 407 are outside the coverage area of ​​BS 410. TRL UL transmissions from MS 402 to BS 410 and XL transmissions between MS 401 and MS 402 interfere with TRL UL transmissions from MS 403 to BS 410, XL transmissions from MS 405 to MS 404, and TRL UL transmissions from MS 404 to BS 410. XL transmissions from MS 405 to MS 404 on the XL may or may not cause interference to other TRL UL transmissions, but they can interfere with other XL transmissions, such as the XL transmission between MS 406 and MS 407. It should be noted that, for simplicity, Figure 4 The text does not describe all interference pairs.

[0083] When XL transmissions occur only within the UL zone, TRL DL transmissions may be unaffected. Power control can account for interference at the BS and interference on other XLs. MSs not receiving on the XL are unaffected by XL transmissions. XL power control considers BS interference measurements and interference measurements taken in the UL by MSs receiving in the UL.

[0084] The following explains the implementation of power control in cases where XL transmissions occur only within the UL area and both MSs involved in direct communication on the XL are attached to a BS. For simplicity, it is assumed that the mobile stations involved in direct communication on the XL are associated with the same infrastructure node. However, the mobile stations involved in direct communication on the XL may be associated with different infrastructure nodes, and in this case, the two infrastructure nodes may share information for controlling the transmit power of the mobile stations on the XL. Resource allocation can be sent from the serving BS of each MS involved in the direct communication to each MS, and the transmit power can be controlled by the serving BS. The mobile stations involved in direct communication on the XL can directly transmit MAC control frames to the serving BS, and this transmission can be power-controlled by the BS (e.g., the same as for 802.16.1 data packets). Control channels can also be directly transmitted to the serving BS and power-controlled (e.g., as in an 802.16.1 control channel). Data packets can be sent to the BS (TRL) or to the peer MS (XL).

[0085] For transmit power control when transmitting to the BS (i.e., interference caused by TRL UL transmissions to other BSs (TRLs) and other XLs), in one implementation, the BS can adjust the TRL UL transmission power of the transmitting MS based on measurements reported from the mobile station and / or neighboring base stations so as not to interfere with transmissions on the XLs and inter-cell or MU-MIMO reception at the BS.

[0086] A Base Station (BS) can instruct mobile stations within a cell and other nearby base stations to report measurements. These measurements may include, but are not limited to: measurements determining link success (e.g., packet error rate, HARQ residuals), measurements determining the level of a specific received signal on a specific resource, measurements determining the level of interference on a specific resource, measurements obtained by other BSs in other cells, and so on. For example, to obtain the interference level on an XL resource, a BS can instruct mobile stations involved in direct communication to measure the interference on UL resources and report it to the BS.

[0087] Measurements can be defined statically or dynamically. In a static measurement method, the mobile station can be instructed by the BS to measure certain resources (in terms of time and frequency) at certain instances (e.g., periodically) within each measurement interval. The number of measurements and the epochs can be handled by the MS implementation. The measurement interval can be on the order of hundreds of milliseconds. The resources that the mobile station needs to measure can be resources used for XL transmissions of any mobile station. The BS can know that certain time and frequency resources are typically allocated to XL, for example, in each frame or subframe, and the BS can provide time and frequency information to the measuring mobile station. Measurement reports can be averaged over frequency, time, or both. If the measurements are averaged, power compensation corrections (e.g., offset) can be sent less frequently using, for example, MAC control messages instead of PHY signaling.

[0088] In a deterministic measurement method, the mobile station can be instructed to perform measurements on specific time and frequency resources. These time and frequency resources can be the same resources allocated to the measuring MS for XL reception. In this implementation, the measurements may not be averaged over time and / or frequency resources, but rather measured and reported over time and frequency resources where the interference source is known to the BS. The measurements can still be averaged over some measurement periods as described above.

[0089] For the implementation in the 802.16.1 system, the transmitting MS can calculate the power according to equation (1). For the data channel, the transmitting MS can calculate the power according to equation (2). Interference with other mobile stations receiving on the XL, or with the serving or other BSs, can be controlled by the serving BS by adjusting and transmitting its correction factor Offset (semi-statically or dynamically).

[0090] For the implementation in the 802.16-2009 system, closed-loop (Equation (3)) or open-loop (Equation (4)) power control can be used. BS can be used to determine the correction factor Offset or Offset_BS for closed-loop and open-loop power control, respectively. perSS Inter-cell interference must be considered. Interference from other mobile stations receiving on the XL can be mitigated by the BS by adjusting and transmitting its correction factors Offset or Offset_BS, used for closed-loop and open-loop power control, respectively. perSS Controlled (semi-statically or dynamically).

[0091] In another implementation, the BS adjusts the MS transmission power by transmitting the Offset value, and the transmitting MS measures the interference on the XL and adjusts the transmission power by taking the interference on the XL into account. The transmitting MS calculates the transmission power and SINR for each stream and each subcarrier of the current transmission as follows. 目标 :

[0092] P = L + SINR 目标 +NI+Offset equation (7)

[0093]

[0094] In equation (8), f(au,bv)=f(γ) IoT SIR DL ,δ XL SIR XL Let f(x) be any non-decreasing function of u and v. For example, the following functions can be used:

[0095] f(au,bv)=au+bv Equation (9)

[0096] f(au,bv)=max(au,bv) Equation (10)

[0097]

[0098] In equation (11), γ IoT ,δ XL They can be combined into a single parameter.

[0099] By using equation (9), equation (8) can be rewritten as follows:

[0100]

[0101] SINR 目标Here, SINR is the target UL SINR required at the receiving MS, P is the TX power level (dBm) for each stream and each subcarrier currently transmitted, L is the estimated average current DL propagation loss calculated by the MS, which includes the MS's TX antenna gain and path loss, NI is the estimated average power level (dBm) of noise and interference for each subcarrier received at the MS, and Offset is a correction term for MS-specific power compensation, which is controlled by the BS via power control messages. 最小 (dB) is the SINR requirement (dataSinrMin) expected by BS for the minimum rate, γIoT is the fairness and IoT control factor for broadcasting, and SIR... DL δ is the linear ratio of the downlink signal pair to the interference power measured by the MS on the DL resources used by the serving BS. α is a factor dependent on the number of receiving antennas at the receiving MS. β is set to 1 to account for the number of streams, otherwise it is set to 0. TNS is the total number of streams (in the case of MU-MIMO, it represents the number of aggregated streams). XL These are the fairness parameters used for XL interference, and SIR. XL It is the linear ratio of the XL signal to the interference power measured on the UL resources used by the XL, as received by the power-controlled MS. The BS can determine the SIR. XL Which resources are measured? Measurements can be XL measurements, where the MS is receiving its own XL data. However, other resources can also be measured.

[0102] In this implementation, the transmitting MS compensates for interference to other MSs in the XL by monitoring its XL received SINR, and compensates for interference to other BSs by monitoring the DL SINR from the serving BS. Parameters γIoT and δ XL Each entity individually controls the tradeoff between its own signal SINR and interference to other BSs or other MSs (on the XL). These can be signaled by the BS or broadcast.

[0103] For transmit power control when transmitting to another MS (i.e., interference caused by XL transmissions to the BS (serving BS and other BSs) and to other XLs), in one implementation, the BS can control the MS power by taking into account interference to itself and other BSs, the SIR at the receiving MS, and interference on other MSs. The BS can instruct mobile stations in the cell and neighboring base stations to perform measurements and report the measurements to the BS, and adjust the power control parameters (e.g., the Offset in Equation (1)) based on the reported measurements. SINR in Equation (2) 最小The required SINR at the receiving MS can be predefined or announced by the BS via signaling. The required SINR at the receiving MS can be maintained by selecting the modulation and coding scheme (MCS) and by using the offset parameter transmitted by the BS. Measurements can be transmitted semi-statically or dynamically.

[0104] The transmitting MS can send the receive power level of the preamble transmitted by the receiving MS to the BS. The transmit power level of the preamble can be known at the BS.

[0105] The receiving MS can send an average SINR measurement to its serving BS via signaling. In this case, the offset correction from the BS can be sent semi-statically. Alternatively, the receiving MS can send packet error rate (HARQ retransmission rate), etc., instead of sending the average SINR. For dynamic operation, the receiving MS can send the received SINR or HARQ retransmission rate information without average to the BS via signaling.

[0106] In the case of MS forwarding (where both MSs on the XL are under the control of the BS), since both the XL and TRL transmissions are scheduled by the BS (e.g., by employing persistent scheduling), the actual forwarding of a packet (from FPSS to the BS) implies successful reception on the XL (from TPSS to FPSS), so that explicit HARQ success information is not required. In this case, bit error rate information can be sent to the BS.

[0107] For the implementation in the 802.16.1 system, the transmitting MS can calculate the power according to equations (1) and (2). Interference with other mobile stations receiving on the XL is controlled by the BS by adjusting and transmitting its correction factor Offset in equation (1) (semi-statically or dynamically).

[0108] For the implementation in the 802.16-2009 system, closed-loop (Equation (3)) or open-loop (Equation (4)) power control can be used. BS can be used to determine the Offset or Offset_BS for the closed-loop or open-loop process respectively. perSS Inter-cell interference is considered. Interference from other MSs receiving in XL is addressed by the BS through adjusting and transmitting its correction factor Offset or Offset_BS, used for closed-loop or open-loop processes respectively. perSS Controlled (semi-statically or dynamically).

[0109] In another implementation, similar to the implementation for TRL UL transmissions, the BS can adjust the transmission power by transmitting the value of the offset, and the transmitting MS measures the interference on the XL and adjusts the transmission power by taking the interference on the XL into account. The transmitting MS can calculate the transmission power and SINR for each stream and each subcarrier of the current transmission according to equations (7)-(12). 目标 .

[0110] In another implementation, when transmitting to another MS on the XL, the power control command can be generated by the receiving MS on the XL based on parameters provided by the BS, such as parameters for controlling the offset correction parameter. Compensation parameters (i.e., correction terms for MS-specific power compensation) can be generated by the receiving MS (e.g., TPSS) and signaled to the transmitting MS (e.g., FPSS). The receiving MS can generate the compensation parameters based on its own reception of data and parameters configured by the BS. The receiving MS (e.g., TPSS) can be allowed to change the compensation parameters between configured minimum and maximum values ​​(Offset_min and Offset_max). The values ​​of Offset_min and Offset_max can be determined by the BS and forwarded to the receiving MS (e.g., via FPSS to TPSS in the case of MS forwarding). Initial values ​​can be transmitted during the initial MS-to-MS association. Alternatively, the receiving MS (e.g., TPSS) can be allowed to change the compensation parameters within a configured range (e.g., a range given by the maximum value of + / - Offset_change_range) based on the last value used at a given time. In this case, the given time can be predefined or announced by the BS via signaling. Alternatively, the compensation parameter can be redefined as the sum of the portions determined by the BS and the MS, as shown in equation (6). Alternatively, the receiving MS (e.g., TPSS) can generate an unrestricted compensation parameter and transmit it to the transmitting MS (e.g., FPSS). This compensation value can then be trimmed to the minimum or maximum value at the transmitting MS.

[0111] An implementation method is disclosed for cases where XL transmissions occur only within the UL zone and where all mobile stations involved in direct communication on the XL are attached to the BS. It is assumed that one MS is associated with the BS while another MS is not. Unlike the implementation method described above, where both mobile stations are attached to the BS (which is symmetrical), in the following implementation method, the two mobile stations in direct communication on the XL are located at different positions relative to the BS.

[0112] In this scenario, an MS not attached to a BS can transmit to and receive from a peer MS, but cannot transmit to or receive from the BS. An MS not attached to a BS can receive its power control commands through a peer MS attached to the BS. An MS attached to a BS transmits to and receives from the BS on the TRL as usual. Power control of an MS attached to a BS can be performed by the peer MS, the BS, or both. In this case, power control is no longer symmetrical because the interference mechanisms are different. The following implementation can be applied to both MS forwarding and MS-to-MS direct communication.

[0113] When a transmitting MS (e.g., FPSS) attached to a BS transmits on a TRL, the implementation of TRL UL transmission disclosed above for when both mobile stations are attached can be implemented.

[0114] When a transmitting MS (e.g., FPSS) attached to a BS transmits on an XL, the transmitting MS can calculate the path loss on the XL to determine the transmit power level for transmission. A receiving MS (e.g., TPSS) on the XL can be instructed to transmit a suitable waveform (e.g., a preamble) that is recognizable to the receiving MS. The transmitting MS can be informed of the preamble's transmit power by the BS. Alternatively, it can be informed by the receiving MS. The transmitting MS measures the received preamble power level and calculates the path loss.

[0115] For the implementation in an 802.16.1-based system, for the control channel transmitted by the transmitting MS on the XL, the transmitting MS can adjust its power for the control channel according to equation (7). The SINR in equation (7) 目标 It can be determined based on the type of channel. For data packets (including MAC frames) transmitted by the transmitting MS on XL, the transmitting MS can adjust its power according to equations (7)-(12).

[0116] For implementations in systems based on 802.16-2009, equations (4) or (5) above can be used with parameters sent by the BS.

[0117] When a transmitting MS (e.g., a TPSS) not attached to a BS transmits on an XL, the TPSS can be either an "interfering TPSS" or a "non-interfering TPSS". A TPSS is non-interfering if it can interfere with the XL transmission of other MSs without interfering with the TRL transmission at the BS. Although a TPSS can interfere with the TRL transmission at the BS, it can be assumed that a TPSS transmission on the XL will not interfere with the TRL transmission at the BS when the TPSS is outside the range of the BS. If another BS is within range, the TPSS can be associated with that other BS, and therefore it can be assumed that the TPSS transmission on the XL does not cause significant interference. If the TPSS MS is not allowed to be associated with other BSs (e.g., a femtocell operating in a closed service group mode), the above assumption may not apply. In this case, significant interference can be created. A TPSS in this case is called an interfering TPSS. Regardless of the interference to the TRL caused by the TPSS, the TPSS can interfere with other XLs. FPSSs also create interference on both the TRL and XL.

[0118] For control channels dealing with both interfering and non-interfering TPSS scenarios, equation (7) can be used. The SINR in equation (7) 目标 It can be determined based on the type of channel.

[0119] For data channels under TPSS interference, equations (7)-(12) can be used. The parameters γIoT and δ in equation (8) XL Together, they control the trade-off between their own signal SINR and interference to other BSs or other MSs (on XL). Parameters γIoT and δ XL It can be sent by the BS using signals and forwarded to the TPSS, or it can be broadcast.

[0120] For a data channel without interference with TPSS, the following equation can be used:

[0121]

[0122] The following describes an implementation for XL transmissions occurring in the UL and DL zones. One MS for direct communication on the XL can be attached to the BS, and this attached MS can transmit in the DL zone. Alternatively, two MSs can be attached to the BS, and one of them transmits in the DL. Without loss of generality, hereinafter, the MS transmitting in the DL zone will be referred to as FPSS, and the other MS will be referred to as TPSS.

[0123] Figure 5 (A)-5(F) illustrate exemplary interference mechanisms in cases where XL transmissions occur in the UL and DL zones. Figure 5In (A)-5(F), solid lines represent TRL or XL transmissions, and dashed lines represent interference caused by TRL or XL transmissions. For example... Figure 5 As shown in (A) and 5(B), XL transmissions in the UL area can cause interference with TRL UL transmissions and XL transmissions in the UL area. Figure 5 As shown in (C) and 5(D), a TRL UL transmission can cause interference to another TRL UL transmission and an XL transmission within the UL zone. Figure 5 As shown in (E) and 5(F), XL transmissions in the DL region can cause interference to TRL DL transmissions and XL transmissions in the DL region. It should be noted that, for simplicity, not all interference pairs are described.

[0124] When TPSS transmits to FPSS in XL within UL area ( Figure 5 (A) and 5(B)), the above-disclosed implementation methods for XL transmission in the UL area can be applied. When the MS transmits to the BS ( Figure 5 (C) and 5(D)), the above-disclosed implementation methods for TRL UL transmission can be applied.

[0125] When an MS (e.g., FPSS) transmits data to an MS (e.g., TPSS) on an XL within a DL area ( Figure 5 The implementation methods for XL transmission in the UL zone disclosed above (E) and 5(F) can be applied, differing only in the location (DL or UL) of the interference and SIR (as used in 802.16.1 power control) measurements. It can also be applied to cases where XL transmission occurs only in the DL zone.

[0126] If the XL transmission occurs on a separate channel from the channel used for TRL transmission, the interference can be attenuated. The channels can be adjacent or not adjacent. An adjacent channel is one that is close enough that a transmission on that channel can create interference on other adjacent channels and can also be interfered with by transmissions on other adjacent channels. The embodiments disclosed above can also be implemented in the case of adjacent channels. To implement the embodiments disclosed above in this case, the XL transmission can be handled by the same network, and this network can have access to both the XL and TRL parameters. The network may not use the same transmission waveform (e.g., one could be CDMA and the other could be OFDMA). An example is TDD transmission of the UL component adjacent to FDD (e.g., XL in 1900-1920 MHz, which is adjacent to the UL portion of HSPA). This case is equivalent to XL in the UL region, except for the attenuated interference.

[0127] Example

[0128] 1. A method for controlling the transmission power of a mobile station.

[0129] 2. The method according to Embodiment 1, the method includes a first mobile station receiving control parameters from a base station.

[0130] 3. The method according to any one of the embodiments 1-2, wherein the method includes the first mobile station calculating correction parameters for power compensation of the transmission from the second mobile station to the first mobile station.

[0131] 4. The method according to any one of the embodiments 1-3, wherein the method includes the first mobile station sending the correction parameters to the second mobile station for transmission from the second mobile station to the first mobile station.

[0132] 5. The method according to any of the foregoing embodiments, wherein the control parameter includes a maximum limit and a minimum limit of the correction parameter, and the correction parameter is generated and lies within the maximum limit and the minimum limit.

[0133] 6. The method according to any of the foregoing embodiments, further comprising the first mobile station sending interference measurements of the first mobile station to the second mobile station.

[0134] 7. The method according to any of the foregoing embodiments, wherein the first mobile station directly receives the control parameters from the base station.

[0135] 8. The method according to any of the foregoing embodiments, wherein the first mobile station receives the control parameters via the second mobile station.

[0136] 9. A method for controlling the transmit power of a mobile station, the method comprising a first mobile station receiving control parameters from a base station.

[0137] 10. The method according to Embodiment 9, wherein the method includes the first mobile station receiving from the second mobile station a correction parameter for power compensation for transmission to the second mobile station.

[0138] 11. The method according to any one of the embodiments 9-10, wherein the method includes the first mobile station calculating a transmit power level for transmission to the second mobile station based on the correction parameters.

[0139] 12. The method according to any one of embodiments 9-11, wherein the method includes the first mobile station transmitting data to the second mobile station according to the transmission power level.

[0140] 13. The method according to any one of embodiments 9-12, further comprising the first mobile station performing a measurement of resources allocated to cross-links for direct communication between mobile stations, wherein the first mobile station calculates the transmit power level based on the measurement.

[0141] 14. The method according to any one of embodiments 9-13, further comprising the first mobile station receiving interference measurement from the second mobile station, wherein the first mobile station calculates the transmit power level based on the interference measurement.

[0142] 15. The method according to any one of the embodiments 9-14, the method further includes the first mobile station calculating the path loss to the second mobile station, wherein the first mobile station calculates the transmit power level based on the path loss.

[0143] 16. A mobile station including a processor configured to receive control parameters from a base station.

[0144] 17. The mobile station according to embodiment 16, wherein the processor is configured to calculate correction parameters for power compensation of transmissions from peer mobile stations.

[0145] 18. A mobile station according to any one of embodiments 16-17, wherein the processor is configured to send the correction parameters to the peer mobile station for transmission from the peer mobile station.

[0146] 19. A mobile station according to any one of embodiments 16-18, wherein the control parameters include a maximum limit and a minimum limit of the correction parameters, and the correction parameters are generated and are within the maximum and minimum limits.

[0147] 20. A mobile station according to any one of embodiments 16-19, wherein the processor is configured to send interference measurements to the peer mobile station.

[0148] 21. A mobile station according to any one of embodiments 16-20, wherein the processor receives the control parameters directly from the base station.

[0149] 22. A mobile station according to any one of embodiments 16-21, wherein the processor receives the control parameters via the peer mobile station.

[0150] 23. A mobile station including a processor configured to receive control parameters from a base station.

[0151] 24. The mobile station according to embodiment 23, wherein the processor is configured to receive from the peer mobile station a correction parameter for power compensation of the transmission to the peer mobile station.

[0152] 25. The mobile station according to embodiment 23, wherein the processor is configured to calculate the transmit power level for transmission to the peer mobile station based on the correction parameters.

[0153] 26. The mobile station according to embodiment 23, wherein the processor is configured to transmit to the peer mobile station according to the transmit power level.

[0154] 27. A mobile station according to any one of embodiments 23-26, wherein the processor is configured to perform a measurement of resources allocated to cross-links for direct communication between mobile stations, and to calculate the transmit power level based on the measurement.

[0155] 28. A mobile station according to any one of embodiments 23-27, wherein the processor is configured to receive interference measurements from the peer mobile station and calculate the transmit power level based on the interference measurements.

[0156] 29. A mobile station according to any one of embodiments 23-28, wherein the processor is configured to calculate the path loss to the peer mobile station and calculate the transmit power level based on the path loss.

[0157] While features and elements in specific combinations have been described above, those skilled in the art will understand that each feature or element can be used alone or in any combination with other features and elements. Furthermore, the methods described herein can be implemented in computer programs, software, or firmware incorporated into a computer-readable medium and executed by a computer or processor. Examples of computer-readable media include electrical signals (transmitted via wired or wireless connections) and computer-readable storage media. Examples of computer-readable media include, but are not limited to, read-only memory (ROM), random access memory (RAM), registers, cache memory, semiconductor storage devices, magnetic media such as internal hard disks and removable disks, magneto-optical media, and optical media such as CD-ROM discs and digital multipurpose discs (DVDs). The processor associated with the software can be used to implement a radio frequency transceiver used in a WTRU, UE, terminal, base station, RNC, or any host computer.

Claims

1. A wireless transmit / receive unit (WTRU), comprising: A circuit configured to receive power control configuration information from a base station associated with WTRU-to-WTRU direct communication for use in WTRU-to-WTRU direct communication; The power control configuration information includes power control configuration information for the uplink channel from the WTRU to the base station, the data channel for WTRU-WTRU direct communication, and the control channel for WTRU-WTRU direct communication. The circuit is also configured to receive time and frequency resource information for WTRU-WTRU direct communication; The circuit is further configured to transmit to the base station via the uplink channel at a power level based on the path loss value and the power control configuration information. The circuit is also configured to selectively use a power level based on path loss value and power control configuration information, or a power level not based on path loss, to transmit data through the data channel based on the time and frequency resource information. as well as The circuit is also configured to transmit power control configuration information for the control channel via the control channel.

2. The WTRU of claim 1, wherein the circuitry is further configured to receive a transmit power control command from the base station for setting the transmit power level of the data channel.

3. The WTRU according to claim 1, wherein the base station is a cellular base station.

4. The WTRU according to claim 3, wherein the cellular base station is an LTE or LTE-A base station.

5. A method for use in a wireless transmit / receive unit (WTRU), the method comprising: Receive power control configuration information from the base station associated with WTRU-to-WTRU direct communication for use in WTRU-to-WTRU direct communication; The power control configuration information includes power control configuration information for the uplink channel from the WTRU to the base station, the data channel for WTRU-WTRU direct communication, and the control channel for WTRU-WTRU direct communication. Receive time and frequency resource information for WTRU-WTRU direct communication; The power level, based on the path loss value and the power control configuration information, is transmitted to the base station via the uplink channel. Based on the received time and frequency resource information, the power level is selectively used based on the path loss value and the power control configuration information, or a power level not based on path loss, to transmit through the data channel; as well as The power control configuration information for the control channel is transmitted through the control channel.

6. The method of claim 5, further comprising receiving from the base station a transmit power control command for setting the transmit power level of the data channel.

7. The method according to claim 5, wherein the base station is a cellular base station.

8. The method according to claim 5, wherein the base station is an LTE or LTE-A base station.

9. A base station, comprising: A circuit configured to transmit power control configuration information to a wireless transmit / receive unit (WTRU) associated with WTRU-to-WTRU direct communication for WTRU-to-WTRU direct communication; wherein the power control configuration information includes power control configuration information for an uplink channel from the WTRU to the base station, a data channel for WTRU-to-WTRU direct communication, and a control channel for WTRU-to-WTRU direct communication. The circuit is also configured to transmit time and frequency resource information for WTRU-WTRU direct communication; and The circuit is further configured to receive power from the WTRU via the uplink channel at a power level based on the path loss value and the power control configuration information.

10. The base station of claim 9, wherein the circuitry is further configured to transmit a transmit power control command to the WTRU for setting the transmit power level of the data channel.

11. The base station according to claim 9, wherein the base station is a cellular base station.

12. The base station according to claim 9, wherein the base station is an LTE or LTE-A base station.

13. A wireless transmit / receive unit (WTRU), comprising: A circuit configured to receive power control configuration information from a base station for use in WTRU-WTRU direct communication; The power control configuration information includes power control configuration information for the uplink channel from the WTRU to the base station, the data channel for WTRU-WTRU direct communication, and the control channel for WTRU-WTRU direct communication. The circuit is also configured to transmit to the base station via the uplink channel at a power level based on the path loss value and the power control configuration information. The circuit is also configured to selectively use a power level based on path loss values ​​and the power control configuration information, or a power level not based on path loss, to transmit data through the data channel; and The circuit is also configured to transmit power control configuration information for the control channel via the control channel.

14. The WTRU of claim 13, wherein the circuitry is further configured to receive from the base station a transmit power control command for setting the transmit power level of the data channel.

15. The WTRU of claim 13, wherein the base station is a cellular base station.

16. The WTRU of claim 15, wherein the cellular base station is an LTE or LTE-A base station.

17. The WTRU of claim 13, further comprising circuitry configured to receive time and frequency resource information for WTRU-to-WTRU direct communication.

18. The WTRU of claim 13, further comprising circuitry configured to transmit time and frequency resource information via the data channel.

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