CN101507220B - Method and apparatus for flexible pilot pattern - Google Patents

Abstract

The present application discloses a method for a wireless communication system, comprising: determining a time position of a subframe in which SFN transmission of data will occur; determining a first transmission mode and a second transmission mode for a reference signal, wherein the transmission mode indicates a symbol and a tone for the reference signal of the subframe; selecting a transmission mode to be used between the first transmission mode and the second transmission mode for the reference signal based on whether SFN data will be sent in the subframe; and broadcasting information about the selected transmission mode before using the selected transmission mode.

Description

Method and apparatus for flexible pilot patterns

Cross References to Related Applications

This application claims the benefit of U.S. Provisional Patent Application No. 60/839,357, filed August 21, 2006, entitled "METHOD ANDAPPARATUS FOR FLEXIBLE PILOT PATTERN," which is hereby incorporated by reference in its entirety.

technical field

The following description relates generally to wireless communications, and more specifically to providing a mechanism with flexible pilot patterns in Orthogonal Frequency Division Multiplexing (OFDM) systems.

Background technique

Wireless communication systems are widely configured to provide various types of communication content, such as voice, data, and so on. A typical wireless communication system may be a multiple access system, which can support communication with multiple users by sharing available system resources (eg, bandwidth, transmit power, etc.). Examples of such multiple access systems may include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems, 3GPP LTE systems, Orthogonal Frequency Division Multiplexing (OFDM), localized Frequency Division Multiplexing (LFDM), Orthogonal Frequency Division Multiple Access (OFDMA) systems, etc.

In a wireless communication system, a Node B (or base station) can transmit data on the downlink to a user equipment (UE) and/or receive data on the uplink from a user equipment. The downlink (or forward link) refers to the communication link from Node B to user equipment, and the uplink (or reverse link) refers to the communication link from user equipment to Node B. The Node B may also send control information (eg allocation of system resources) to the user equipment. Similarly, user equipment may send control information to Node Bs to support data transmission on the downlink, or for other purposes.

A multicast or broadcast transmission mode is used in the prior art system, and Node B can transmit to multiple user equipments operating in the system. It would be feasible to operate a multicast or broadcast (point-to-multipoint) transmission as a single frequency network (SFN) and take advantage of the higher enhanced data rates offered by this SFN transmission. SFN allows one or more adjacent cells to transmit the same content on the same sub-channel in the downlink. However, SFN transmission may not be efficient if an entire portion of the bandwidth is used on the downlink when other non-data information also needs to be transmitted.

Contents of the invention

A brief summary of one or more embodiments is presented below in order to provide a basic understanding of these embodiments. This summary is not an extensive overview of all contemplated embodiments, nor is it intended to identify key elements of all embodiments or delineate the scope of any or all embodiments. Its sole purpose is to introduce some concepts of one or more embodiments in a simplified form as a prelude to the more detailed description that is presented later.

According to one aspect, a method for a wireless communication system, comprising: determining a time position of a subframe where SFN transmission of data will occur; determining a first transmission mode and a second transmission mode for a reference signal, wherein the above The transmission mode indicates the symbols and tones for the reference signal for the subframe; the transmission to use is selected between this first transmission mode and the second transmission mode for the reference signal based on whether SFN data will be transmitted in the subframe mode; and broadcasting information about the selected transmission mode prior to using the selected transmission mode.

According to one aspect, a method for a wireless communication system, comprising: determining a time position of a subframe in which SFN transmission of data will occur; determining a first transmission mode for sending a reference signal, wherein the first transmission mode including positions of tones allocated for transmitting reference signals and positions of symbols in the subframe; and broadcasting information about the first transmission mode before using the first transmission mode.

According to one aspect, a method for a wireless communication system includes: using a first transmission mode, wherein the first transmission mode includes tones for transmitting a set of data according to a single frequency network (SFN) transmission scheme; using the first transmission mode Two transmission modes, wherein the second transmission mode includes tones for sending reference signals; and broadcasting information about the first and second transmission modes prior to using the first and second transmission modes.

According to one aspect, a method for a wireless communication system, comprising: receiving a time position of a subframe in which an SFN transmission of data will occur; and receiving information about a first transmission mode, wherein the information includes a A frequency network (SFN) transmission scheme transmits location information of at least one resource block of a set of data in time and frequency.

According to one aspect, a method for a wireless communication system, comprising: receiving a time position of a subframe in which an SFN transmission of data will occur; and receiving information about a first transmission mode, wherein the information includes a reference for transmitting Location information of at least one resource block of the signal in time and frequency.

To the accomplishment of the foregoing and related ends, one or more embodiments incorporate the features hereinafter fully described and particularly pointed out in the claims. The description below and the annexed drawings set forth in detail certain example aspects of one or more embodiments. These aspects are illustrative only, principles of various embodiments may employ some of the various aspects, and the described embodiments are intended to include all such aspects and their equivalents.

Description of drawings

FIG. 1 illustrates a wireless communication system in accordance with various aspects set forth herein.

Figure 2 depicts an example communication device for use in a wireless communication environment.

Figure 3 shows a cell specific pilot transmission mode.

Figure 4 shows a transmission mode with SFN transmission.

Figure 5 shows a transmission mode with SFN transmission on every symbol of a subframe.

Figure 6 shows a frame structure using various downlink transmissions.

7 illustrates an example methodology for broadcasting an indication of a selected downlink (DL) transmission (TX) mode.

8 illustrates an example methodology for receiving an indication of a selected downlink (DL) transmission (TX) mode.

9 depicts an example access terminal capable of providing feedback to a communications network.

Figure 10 illustrates an example base station that can be used with the wireless network environment disclosed herein.

11 depicts an example system capable of providing feedback to a wireless communication environment in accordance with one or more aspects.

12 depicts an example system capable of using flexible transport mode techniques in accordance with one or more aspects.

13 depicts an example system capable of using flexible transmission mode techniques in accordance with one or more aspects.

14 depicts an example system capable of using flexible transmission mode techniques in accordance with one or more aspects.

15 depicts an example system capable of using flexible transport mode techniques in accordance with one or more aspects.

Detailed ways

Various aspects are described below with reference to the drawings, like reference numerals being used to indicate like elements throughout. The following description is illustrative, and numerous specific details are set forth to provide a thorough understanding of one or more aspects. It is evident that these aspects may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate describing one or more aspects.

Additionally, various aspects of the disclosure are described below. Obviously, the teachings herein can be implemented in a wide variety of forms, and any specific structure and/or function disclosed herein is merely representative. Based on the teachings herein one skilled in the art will appreciate that an aspect disclosed herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, any aspect set forth herein may be used to implement an apparatus and/or implement a method. Additionally, an apparatus may be implemented and/or a method may be practiced using other structure and/or functionality than one or more aspects set forth herein. As an example, many of the methods, devices, systems, and apparatus described herein are described in the context of an ad-hoc or unplanned/semi-planned configuration wireless communication environment that provides synchronous transmission and retransmission of SFN data. Those skilled in the art will appreciate that similar techniques can be applied to other communication environments.

As used in this application, the terms "component," "system," and the like are intended to refer to a computer-related entity, which may be hardware, software, software in execution, firmware, middleware, microcode, and/or any combination thereof . For example, a component may be, but is not limited to being, a process running on a processor, a processor, an object, an executable, a thread of execution, a program, and/or a computer. One or more components can reside within a process and/or thread of execution and a component can be localized on one computer and/or distributed among two or more computers. Also, these components can execute from various computer readable media having various data structures stored thereon. For example, based on a signal having one or more packets (e.g., data from a component through which the component interacts with another component in a local system, in a distributed system, and/or with other components across a network such as the Internet system interoperability), these components can communicate by means of local and/or remote processing. Additionally, those skilled in the art will appreciate that components of the systems described herein may be rearranged and/or supplemented with additional components to achieve the described aspects, objectives, benefits, etc., without being limited to what is shown in a given figure Precise configuration.

Additionally, various aspects described herein relate to subscriber stations. A subscriber station can also be called a system, a subscriber unit, mobile station, mobile station, remote station, remote terminal, access terminal, user terminal, user agent, user device, or user equipment. A subscriber station may be a cellular telephone, a cordless telephone, a Session Initiation Protocol (SIP) telephone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless connectivity, or other processing device that Connected to a wireless modem or similar device that enables it to communicate wirelessly with a processing device.

Additionally, various aspects or features described herein may be implemented as a method, apparatus, or article of manufacture using standard procedures and/or engineering techniques. The term "article of manufacture" as used herein is intended to include a computer program accessible from any computer-readable device, carrier, or media. For example, computer readable media may include, but are not limited to, magnetic storage devices (e.g., hard disk, floppy disk, magnetic tape), optical disks (e.g., compact disk (CD), digital versatile disk (DVD), etc.), smart cards, and flash memory devices (e.g., card, stick, key drive, etc.). Additionally, various storage media described herein can represent one or more devices and/or other machine-readable media for storing information. The term "machine-readable medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing and/or carrying instructions and/or data.

Additionally, the word "example" as used herein means an example, instance, or illustration. Any aspect or design described herein as "example" should not be considered preferred or superior to other aspects or designs. Rather, the use of the word "example" is intended to introduce concepts in a concrete manner. As used in this application, the term "or" is intended to mean a non-exclusive "or", not an exclusive "or". That is, unless otherwise specified or clear from context, "X employs A or B" is used to refer to any natural non-exclusive permutation, that is, if X employs A, X employs B, or X employs both A and B Both, then "X employs A or B" satisfies any of the preceding instances. Additionally, the article "a" as used in this application and the appended claims is generally to be construed as "one or more" unless specifically specified or clearly indicated to be a single form from context.

As used herein, the term "inference" generally refers to the process of inferring or inferring the state of a system, environment, and/or user from a set of observations obtained via events and/or data. "Inference" can be used, for example, to identify a particular context or action, or to generate a probability distribution over states. "Inference" can be probabilistic, that is, the calculation of a probability distribution over states of interest based on a consideration of data and events. "Inference" can also refer to techniques employed for composing higher-level events from a set of events and/or data. "Inference" results in the construction of new events or actions from a set of observed events and/or stored event data, whether or not these events are closely related in time, and whether or not these events and data are derived from one or several events and data source.

等的无线技术。UTRA、E-UTRA和GSM是通用移动通信系统(UMTS)的一部分。长期演进(LTE)是使用E-UTRA的即将发布的UMTS版本。在名称为“第三代合作伙伴计划”(3GPP)的组织的文献中描述了UTRA、E-UTRA、GSM、UMTS和LTE。“第三代合作伙伴计划2”(3GPP2)组织的文献中描述了cdma2000。这些各种各样的无线技术和标准在本领域是公知的。为清楚起见，以下描述了用于LTE技术的某些方面，LTE术语在下面描述中的许多地方使用。The techniques described herein can be used in various wireless communication networks such as Code Division Multiple Access (CDMA) networks, Time Division Multiple Access (TDMA) networks, Frequency Division Multiple Access (FDMA) networks, Orthogonal Frequency Division Multiple Access (OFDMA) network, single carrier frequency division multiple access (SC-FDMA) network, etc. The terms "network" and "system" are often used interchangeably. A CDMA network may implement a radio technology such as Universal Terrestrial Radio Access (UTRA), cdma2000, and so on. UTRA includes Wideband Code Division Multiple Access (W-CDMA) and Low Chip Rate (LCR). cdma2000 covers IS-2000, IS-95 and IS-856 standards. A TDMA network may implement a radio technology such as Global System for Mobile Communications (GSM). OFDMA networks can implement, for example, Evolved UTRA (E-UTRA), IEEE 802.11, IEEE802.16, IEEE 802.20, Flash

and other wireless technologies. UTRA, E-UTRA and GSM are part of the Universal Mobile Telecommunications System (UMTS). Long Term Evolution (LTE) is an upcoming release of UMTS that uses E-UTRA. UTRA, E-UTRA, GSM, UMTS and LTE are described in documents from an organization named "3rd Generation Partnership Project" (3GPP). cdma2000 is described in documents from the "3rd Generation Partnership Project 2" (3GPP2) organization. These various wireless technologies and standards are well known in the art. For clarity, certain aspects for LTE technology are described below, and LTE terminology is used in many places in the following description.

Single Carrier Frequency Division Multiple Access (SC-FDMA) uses single carrier modulation and frequency domain equalization techniques. SC-FDMA has similar performance and substantially the same overall complexity as OFDMA systems. SC-FDMA signals have lower peak-to-average power ratio (PAPR) due to the inherent single-carrier structure. SC-FDMA has attracted a lot of attention, especially in uplink communication, where lower PAPR greatly benefits mobile terminals in terms of transmit power efficiency. It is currently a working assumption for the uplink multiple access scheme in 3GPP Long Term Evolution (LTE), or Evolved UTRA.

FIG. 1 shows a wireless communication system 100 having multiple base stations 110 and multiple terminals 120, for example, which may be used in conjunction with one or more aspects. A base station is typically a fixed station that communicates with the terminals and may also be called an access point, Node B or some other terminology. Each base station 110 provides communication coverage for a particular geographic area, three of which are illustrated, labeled 102a, 102b, and 102c. The term "cell" can refer to a base station and/or its coverage area depending on the context in which it is used. In order to improve system capacity, the coverage area of a base station can be divided into multiple smaller areas (for example, the cell 102a in FIG. 1 has three smaller areas 104a, 104b and 104c). Each smaller area may be served by a respective Base Transceiver Subsystem (BTS). The term "sector" can refer to a BTS and/or its coverage area depending on the context in which it is used. For a sectorized cell, the BTSs for all sectors of the cell are typically co-located within the cell's base station. The transmission techniques described herein can be used in systems using sectorized cells as well as systems using unsectorized cells. For simplicity, the term "base station" in the following description generally refers to a fixed station serving a sector as well as a fixed station serving a cell.

Terminals 120 are typically distributed throughout the system, and each terminal may be fixed or mobile. A terminal may also be called a mobile station, user equipment, user device or some other terminology. Terminals can be wireless devices, cellular phones, personal digital assistants (PDAs), and wireless modem cards, among others. Each terminal 120 may communicate with zero, one or more base stations on the downlink and uplink at any given time. The downlink (or forward link) refers to the communication link from the base station to the terminal, and the uplink (or reverse link) refers to the communication link from the terminal to the base station.

For a centralized architecture, a system controller 130 couples to and provides coordination and control for base stations 110 . For a distributed architecture, base stations 110 can communicate with each other as needed. Data transmission on the forward link is from an access point to an access terminal at or near the maximum data rate supported by the forward link and/or communication system. Other channels of the forward link (eg, control channels) may be sent from multiple access points to an access terminal. Data communications on the reverse link may be from one access terminal to one or more access points.

2 illustrates an ad-hoc or unplanned/semi-planned wireless communication environment 200 in accordance with various aspects. System 200 may include one or more base stations 202 in one or more sectors that receive, transmit, and retransmit wireless communication signals with each other and/or with one or more mobile devices 204. communication signal. As shown, each base station 202 can provide communication coverage for a particular geographic area, four geographic areas are illustrated, labeled 206a, 206b, 206c, and 206d. Each base station 202 may include a transmitter chain and a receiver chain, each including a plurality of components associated with signal transmission and reception (e.g., processors, modulators, multiplexers, etc.) devices, demodulators, demultiplexers, antennas, etc.). Mobile device 204 may be, for example, a cellular telephone, smart phone, laptop computer, handheld communication device, handheld computing device, satellite radio, global positioning system, PDA, and/or any other suitable device for communicating over wireless network 200 . System 200 can be used in conjunction with various aspects described herein to provide a flexible pilot pattern.

等的无线技术。这些各种各样的无线技术和标准在本领域是公知的。UTRA、E-UTRA和GSM是通用移动通信系统(UMTS)的一部分。长期演进(LTE)是使用E-UTRA的即将发布的UMTS版本。在名称为“第三代合作伙伴计划”(3GPP)的组织的文献中描述了UTRA、E-UTRA、GSM、UMTS和LTE。“第三代合作伙伴计划2”(3GPP2)组织的文献中描述了cdma2000。为清楚起见，以下描述了用于LTE中上行链路传输的技术的某些方式，3GPP术语在下面描述中的许多地方使用。The techniques described herein can be used in various wireless communication systems such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), and Single Carrier Frequency Division Multiple Access (SC-FDMA) systems. The terms "system" and "network" are often used interchangeably. A CDMA system may implement a radio technology such as Universal Terrestrial Radio Access (UTRA), cdma2000, and so on. UTRA includes Wideband Code Division Multiple Access (W-CDMA) and Low Chip Rate (LCR). cdma2000 covers IS-2000, IS-95 and IS-856 standards. A TDMA system can implement a radio technology such as Global System for Mobile Communications (GSM). The OFDMA system can implement, for example, Evolved UTRA (E-UTRA), IEEE 802.11, IEEE 802.16, IEEE802.20, Flash

and other wireless technologies. These various wireless technologies and standards are well known in the art. UTRA, E-UTRA and GSM are part of the Universal Mobile Telecommunications System (UMTS). Long Term Evolution (LTE) is an upcoming release of UMTS that uses E-UTRA. UTRA, E-UTRA, GSM, UMTS and LTE are described in documents from an organization named "3rd Generation Partnership Project" (3GPP). cdma2000 is described in documents from the "3rd Generation Partnership Project 2" (3GPP2) organization. For clarity, certain approaches to techniques for uplink transmission in LTE are described below, and 3GPP terminology is used in many places in the following description.

LTE uses Orthogonal Frequency Division Multiplexing (OFDM) on the downlink and Single Carrier Frequency Division Multiplexing (SC-FDM) on the uplink. OFDM and SC-FDM divide the system bandwidth into a number (N) of orthogonal subcarriers, also commonly referred to as tones, bins, etc., each of which can be modulated with data. Typically, modulation symbols are sent in the frequency domain with OFDM and in the time domain with SC-FDM. For LTE, the spacing between adjacent subcarriers may be fixed, and the total number of subcarriers (N) may depend on the system bandwidth. In one design solution, for a system bandwidth of 5 MHz, N=512, for a system bandwidth of 10 MHz, N=1024, and for a system bandwidth of 20 MHz, N=2048. In general N can be any integer value.

The LTE downlink transmission scheme is divided by radio frames (for example, 10 ms radio frames). Each frame includes a pattern consisting of frequency (eg, subcarriers) and time (eg, OFDM symbols). The 10 ms radio frame is divided into a plurality of adjacent 0.5 ms subframes (also referred to as subframes or time slots, which are used interchangeably below). Each subframe includes multiple resource blocks, where each resource block consists of one or more subcarriers and one or more OFDM symbols. One or more resource blocks may be used for the transmission of data, control information, pilots (also known as reference signals), or any combination thereof.

To achieve the most efficient use of SFN and cell-specific (eg unicast or multicast) schemes, different methods for multiplexing SFN and cell-specific pilots in the downlink are described herein. A cell-specific pilot is sent using FDM and scrambled with a cell-specific scrambling code. Using FDM operation allows greater than 1 frequency reuse where pilot tones from a few neighboring cells do not collide with each other. This results in improved channel estimation, especially at cell edges.

Figure 3 shows a cell-specific pilot transmission pattern 300 for a subframe for downlink transmission according to an example. According to an example, the cell-specific pilot pattern is used for a subframe of a radio frame consisting of a time period 360 and a frequency bandwidth 362 . In the pilot pattern of this example, all tones of symbol 306 are assigned to transmit pilot information. Following this example, up to six cells will not collide since their pilot transmissions are done using different tones within one symbol period. For example, the pilot information for cell 0 is sent using tones 304, 320, and 332, the pilot information for cell 1 is sent using tones 310, 322, and 334, the pilot information for cell 2 is sent using tones 312, 324, and 336, and the pilot information for cell 3 is sent using tones 312, 324, and 336. Pilot information is sent using tones 314, 326, and 338, pilot information for cell 4 is sent using tones 316, 328, and 340, and pilot information for cell 5 is sent using tones 318, 330, and 342. This pattern may repeat for several symbol periods, such as symbol periods 352 and 354. For the remaining tones in the subframe, the transmitter may send non-pilot information. According to one aspect, cell 0 may transmit data or other information (eg, non-pilot information) on the same tones used by cells 1, 2, 3, 4, and 5 to transmit pilot. Consequently, these pilot tones experience lower interference power spectral density (PSD) and higher signal-to-noise ratio (SNR), which leads to improved channel estimation. Depending on the system configuration, fewer or more cells may be designated without conflict.

Figure 4 shows a transmission pattern 400 with SFN transmission for subframes for downlink transmission in which cell-specific pilots are multiplexed with SFN data (e.g., data sent with the SFN transmission scheme) in accordance with one aspect on the same subframe. According to an example, the transmission pattern is for a subframe of a radio frame consisting of a time period 460 and a frequency bandwidth 462 . In this example mode, all tones of symbol 406 are allocated to transmit pilot information. In this example, six cells are shown that do not conflict with each other, and this is achieved by assigning a tone to each cell to transmit pilot information. For example, pilot information for cell 0 is sent using tones 404, 420, and 432, pilot information for cell 1 is sent using tones 410, 422, and 434, pilot information for cell 2 is sent using tones 412, 424, and 436, and pilot information for cell 3 is sent using tones 410, 422, and 434. Pilot information is sent using tones 414, 426, and 438, pilot information for cell 4 is sent using tones 416, 428, and 440, and pilot information for cell 5 is sent using tones 418, 430, and 442. The pattern may repeat for several symbol periods, such as symbol periods 452 and 454. The remaining tones are designated for SFN transmission (shaded in Figure 4). In one aspect, when SFN transmissions and cell-specific transmissions are multiplexed in the same subframe, the frequency reuse may not be greater than 1 for cell-specific subframes that do not allow cells to collide with each other due to the nature of SFN transmissions Caused. Then, in this example, cell 0 cannot send SFN transmissions on the tones used by cells 1, 2, 3, 4, and 5 to send pilot information. Therefore, non-pilot tones cannot be used for SFN data for a given cell if pilots from different cells are not allowed to collide with each other. However, cell 0 may transmit other information such as control information, assignments, null tones (so that the frequency reuse pattern on this null tone is the same as the frequency reuse pattern on data tones) or any non-pilot and non-SFN data . The transmission pattern for cell 0 may then include the transmission of pilot tones, eg, tones 404, 420, and 432, repeated based on the number of cells designated to avoid collisions. The transmission pattern may further include non-pilot and non-SFN transmissions on tones that other cells use for pilot transmissions, for example, tones 410, 412, 414, 416, 418, 422, 424, 426, 428, 430, 434, 436, 438, 440 and 442. The remaining tones in this example subframe will be used for SFN transmission.

FIG. 5 shows a downlink (DL) transmission (TX) pattern 500 (also referred to as SFN+CS transmission pattern) according to another aspect, wherein the cell-specific pilot is associated with SFN data (e.g., data transmitted using the SFN transmission scheme). ) are multiplexed on the same subframe. According to an example, the transmission pattern is used for a subframe of a radio frame consisting of a time period 560 and a frequency bandwidth 562 . According to one aspect, all cells in the system are required to use designated tones for pilot transmission (shown as unicast), null tones, or any combination thereof. According to this example transmission mode, resource blocks defined at subcarriers 504, 520 and 532 and symbols 506, 552 and 554 are used by all cells in the system for pilot information transmission. According to another aspect, a transmission pattern (not shown) can be used to allocate pilot tones that do not collide with pilot tones used by other cells. The remaining tones are allocated to the SFN transmission scheme for delivering the content to the user equipment. Therefore, the pilots of each cell allow collisions and allow SFN transmissions on a larger set of tones.

For a flexible pilot pattern scheme, the tones designated for pilot transmission can be contiguous in frequency, time, or any combination thereof. In one aspect, then, a SFN+CS transmission pattern has all pilot tones contiguous in frequency. In another aspect, a SFN+CS transmission pattern has all pilot tones contiguous in time. In yet another aspect, a SFN+CS transmission pattern has all tones designated for cell-specific pilot transmissions contiguous in frequency and clustered at the top of the frequency bandwidth of the subframe, e.g., all pilot transmission tones at symbol 506, 570 of 552 and 554 are adjacent. In another aspect, a SFN+CS transmission pattern has all tones designated for cell-specific pilot transmission contiguous in frequency and clustered in the middle of the frequency bandwidth of the subframe, e.g., all pilot transmission tones within symbol 506, 572 of 552 and 554 are adjacent. In another aspect, a SFN+CS transmission pattern has all tones designated for cell-specific pilot transmissions contiguous in frequency and clustered at the bottom of the frequency bandwidth of the subframe, e.g., all pilot transmission tones at symbol 506, 574 of 552 and 554 are adjacent. It should be noted that, depending on the system, not all cells may repeat pilot transmissions in frequency and time. Thus, for example, a cell may transmit pilots only on the tones specified by subcarrier 504 of symbols 506, 552 and 554, or only on subcarriers 504, 520 and 532 of symbol period 552.

Figure 6 shows a frame structure 600 that uses the downlink transmission mode described above during system operation. According to one aspect, cell-specific pilots are transmitted using one or more patterns selected from a set of downlink transmission patterns. For example, in time period 602, four subframes 604, 606, 608, and 610 are transmitted. In one aspect, for subframe 604, the system may select a first pattern (e.g., cell-specific reuse greater than 1 as described in FIG. 3 ) or a second pattern (e.g., cell-specific + SFN and all variants of this model). For the 606, 608 and 610 subframes, the system can use either the first or the second pattern. Thus, in subframes without SFN transmissions, the cell-specific pilot pattern corresponds to a frequency reuse greater than one, and in other subframes the pattern corresponds to a frequency reuse equal to one.

Each cell includes a mechanism for selecting the downlink transmission mode based on all conditions of the system, data rate requirements, necessary delivery rates for certain content, etc. The SFN+CS transmission mode may be used periodically. In this case, the allocation of subframes selected to use the SFN+CS transmission mode is broadcast periodically in each cell. Once a downlink transmission mode is selected, all cells in the system will broadcast (eg, signaled using a broadcast channel) information about the selected downlink transmission mode. This can be done by sending an indicator (one or more bits) and subframes to the user equipment when the downlink transmission mode is to be used by the cell. The downlink transmission mode may only be valid for one subframe, where the indicator has to be re-signaled or broadcast before the selected downlink transmission mode is used. Optionally, one or more subframes may be allocated to use the selected downlink transmission mode. In this case, information about the allocated subframes will be broadcast by the cell to the user equipments using eg the SFN+CS transmission mode.

In one aspect, the downlink transmission modes described above may be identified with an identifier. In order to reduce overhead, only the transmission mode identifier and the assigned subframe number are broadcast to the user equipment. The user equipment can then retrieve from memory the correct processing method associated with the transmission mode and use that method to process the received transmission for the specified subframe.

Refer to Figures 7-8 for a method for a mechanism that uses and broadcasts an indication of the SFN+CS transmission mode allocated as a downlink transmission for one subframe. However, while the method is illustrated and described as a series of operations for simplicity of illustration, it is to be understood and appreciated that the method should not be limited by the order of operations, as some operations may occur in a different order depending on the claimed subject matter and and/or concurrently with other operations shown and described herein. For example, those skilled in the art will understand and appreciate that a methodology could alternatively be represented as a series of interrelated states or events, such as in a state diagram. Furthermore, not all illustrated operations may be required to implement a methodology in accordance with the claimed subject matter.

With particular reference to FIG. 7, an example method 700 for broadcasting an indication of a selected downlink transmission mode in a wireless communication system according to an aspect is depicted. The method 700 enables an indication to be sent from a cell (e.g., an enhanced node base station, eNode B, access point (AP), base station, or the like) to one or more terminal devices (e.g., user equipment, UE, etc.) in the wireless communication network , AT or similar). The method starts at 702 by determining whether it is time to use SFN transmission for downlink transmission. In one aspect, the cell periodically determines whether SFN transmission is required to transmit content at an enhanced data rate or receives a request from the system to begin using SFN transmission. In one aspect, the cell receives an indication from the system to perform an SFN transmission and the time location of the subframe in which the SFN transmission of the data should occur. If it is determined that SFN transmission is required, the method executes blocks 704, 706 and 708. Otherwise, at block 720, the method continues using a default transmission mode, such as the first mode described in FIG. 3 . At block 704, the cell determines a SFN transmission mode from one or more transmission modes, each of which indicates the number of subframes used for reference signals (such as pilot data) and for sending data using the SFN transmission scheme. symbols and tones. Once the transmission mode is selected, the cell allocates the selected mode for the specified subframe. Depending on the system, the method selects an SFN transmission mode from a list of several SFN transmission modes available. For example, the SFN+CS transmission pattern described in Figure 5 above, or a variation of this pattern (eg, a pattern with frequency and/or time based aggregation or staggered pilot tones). The method proceeds to block 706 after a transmission mode is selected. At 706, the cell broadcasts the selected downlink transmission mode information and the designated subframes valid for all user equipments served by the cell. According to system requirements, the method may pre-broadcast the indication, and allow all user equipments to receive the indication before using the selected downlink transmission mode. The indication may be a predetermined transmission mode identifier or more detailed information about the selected transmission mode. At block 708, the method transmits data (eg, content) using the downlink transmission mode selected for the specified subframe.

Referring to FIG. 8, an example methodology 800 for receiving an indication of a selected downlink transmission mode in a wireless communication system according to an aspect is depicted. Method 800 enables receiving an indication from a cell (eg, an enhanced node base station, eNodeB, access point (AP), base station, or the like) in a wireless communication network. According to an aspect, at block 802, the method receives an indication on the forward link of processing a specified subframe using a specified SFN transmission mode (eg, SFN+CS transmission mode). At block 804, the method begins processing the received transmission based on the SFN transmission mode specified for the specified subframe.

9 depicts an example access terminal 900 capable of providing feedback to a communications network in accordance with one or more aspects. Access terminal 900 includes a receiver 902 (eg, an antenna) that receives signals and performs certain operations on the received signals (eg, filtering, amplifying, downconverting, etc.). In particular, the receiver 902 may also receive a service schedule, an associated schedule, etc., the service schedule defines the services allocated in one or more blocks of a transmission allocation period, and the associated schedule defines the downlink resources A block is associated with an uplink resource block used to provide the feedback information described herein. Receiver 902 can include a demodulator 904 that can demodulate received symbols and provide them to a processor 906 for evaluation. Processor 906 may be a processor dedicated to analyzing information received by receiver 902 and/or generating information sent by transmitter 916 . Additionally, processor 906 may be a processor that controls one or more components of access terminal 900, and/or may be a processor that analyzes information received by receiver 902, generates information to be transmitted by transmitter 916, and controls interface A processor of one or more components of the terminal 900. Additionally, as described herein, processor 906 may execute instructions to interpret correlations between uplink resources and downlink resources received by receiver 902, to identify unreceived downlink blocks, or to generate A feedback message (eg, a bitmap) for these unreceived blocks is signaled, or a hash function is analyzed to determine the appropriate one of the plurality of uplink resources.

Access terminal 900 may additionally include memory 908 that is operatively coupled to processor 906 and that may store data to be transmitted, received, or the like. Memory 908 may store information associated with downlink resource scheduling, protocols for evaluating the aforementioned protocols, and protocols for identifying unreceived portions of a transmission, determining an undecipherable transmission, sending feedback messages to the access point, etc.

It will be appreciated that the data store described herein, such as memory 908, can be either volatile or nonvolatile memory, or can include both volatile and nonvolatile memory. By way of illustration and not limitation, nonvolatile memory can include read only memory (ROM), programmable read only memory (PROM), electrically programmable read only memory (EPROM), electrically erasable programmable read only memory (EEPROM ) or flash memory. Volatile memory can include random access memory (RAM), which acts as external cache memory. By way of illustration and not limitation, random access memory RAM comes in many forms such as synchronous random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double rate synchronous dynamic random access memory (DDR SDRAM), Enhanced Synchronous Dynamic Random Access Memory (ESDRAM), Synchronous Link Dynamic Random Access Memory (SLDRAM) and Direct Rambus RAM (DRRAM). Memory 908 of the subject systems and methods is intended to include, but is not limited to, these and any other suitable types of memory.

Receiver 902 is further operatively coupled to multi-antenna 910, which is capable of receiving multiple antennas in one or more additional downlink transmission resource blocks and one uplink transmission resource block (e.g., to provide multiple Scheduled correlation between negative acknowledgment (NACK) or acknowledgment (ACK) messages). The multiplexing processor 906 may include a multi-bit bitmap within a feedback message providing an ACK or NACK message indicating the number of bits in the first downlink block and one or more additional downlink blocks. Each is received or not received on a single uplink resource. Additionally, computing processor 912 can receive a feedback probability function that limits the probability that a feedback message is provided by access terminal 900 if a downlink transmission resource block or data associated therewith is not received, as described herein. In particular, the probability function described above can be used to reduce interference if multiple devices are reporting missing data at the same time.

Access terminal 900 still further includes a modulator 914 and a transmitter 916 that transmits signals to, for example, a base station, an access point, another access terminal, a remote agent, and the like. Although signal generator 910 and indicator evaluator 912 are described as being separate from processor 906, it will be appreciated that signal generator 910 and indicator evaluator 912 may be part of processor 906 or a plurality of processors (not shown). )a part of.

Figure 10 shows a system 1000 capable of providing feedback to an LTE network regarding lost transmitted data. System 1000 includes a base station 1002 (e.g., access point, etc.) having a receiver 1010 that receives signals from one or more mobile devices 1004 via a plurality of receive antennas 1006 and a transmitter 1022 that receives signals via transmit antennas 1008. Send data to one or more mobile devices 1004. Receiver 1010 may receive information from receive antenna 1006 and may further include a signal receiver (not shown) that receives feedback data related to unreceived or undecipherable data packets. Additionally, receiver 1010 is operatively associated with demodulator 1012 for demodulating received information. The demodulated symbols are analyzed by a processor 1014 coupled to a memory 1016 which stores: information related to correlations of uplink resources and downlink resources, providing dynamic and/or static correlations from a network related information, as well as data to be transmitted or received from mobile device 1004 (or a different base station (not shown)), and/or any other suitable information related to performing the various operations and functions set forth herein.

The processor 1014 is further coupled to an association processor 1018 capable of scheduling correlations between downlink transmission resource blocks and uplink transmission resource blocks for multicast or broadcast traffic during allocation. Additionally, the association processor 1018 may further schedule a correlation between one or more additional uplink transmission resource blocks and the downlink transmission resource block to enable receipt of multiple feedback messages for the downlink resource block . As a result, a relative number of feedback messages related to the downlink resource can be determined. In addition, the association processor 1018 can schedule the correlation between multiple downlink transmission resource blocks for multicast or broadcast traffic and one uplink transmission resource, so that a single bitmap included in the feedback message can ACK or NACK information is indicated for the plurality of downlink transmission resource blocks.

The association processor 1018 can be coupled to a computing processor 1020 that generates a probability factor that can limit the likelihood that the terminal device will provide the feedback message. The base station 1002 can use the probability factor to reduce feedback interference from multiple terminal devices. In addition, computing processor 1020 may generate a hash function sent by base station 1002 capable of indicating to each of the plurality of terminal devices the specific uplink transmission resource used when submitting the feedback message. The indication of the hash function may be based at least in part on an access category of each terminal device, a hash of each terminal identification, an identification of a service used by each terminal device, or block specific information, or a combination thereof.

Additionally, the computing processor 1020 may be coupled to a ranking processor 1021 capable of determining the number of received feedback messages related to downlink transmission resource blocks. For example, if a downlink transmission resource block is associated with multiple uplink transmission resources (e.g., the association is scheduled by the association processor 1018 described above), the base station 1002 can receive two or more feedback messages. The ordering processor 1021 can thus identify what feedback message corresponds to that downlink block, which can indicate a retransmission priority for that downlink block. Furthermore, the ordering processor 1021 can select between retransmitting a plurality of downlink transmission resource blocks based at least in part on the number of received feedback messages associated with each downlink transmission resource block.

Referring now to FIG. 11, on the downlink, at access point 1105, transmit (TX) data processor 1110 receives, formats, codes, interleaves, and modulates (or symbol maps) traffic data and provides modulation symbols (“ data symbol"). A symbol modulator 1115 receives and processes the data symbols and pilot symbols and provides a stream of symbols. A symbol modulator 1115 multiplexes data and pilot symbols and provides them to a transmitter unit (TMTR) 1120 . Each transmitted symbol can be a data symbol, a pilot symbol, or a signal with a value of zero. Pilot symbols may be sent continuously in each symbol period. The pilot symbols may be frequency division multiplexed (FDM), orthogonal frequency division multiplexed (OFDM), time division multiplexed (TDM), frequency division multiplexed (FDM), or code division multiplexed (CDM).

TMTR 1120 receives and converts the stream of symbols into one or more analog signals, and further conditions (eg, amplifies, filters, and frequency upconverts) the analog signals to generate a downlink signal suitable for transmission over a wireless channel. The downlink signal is then transmitted to the terminal through the antenna 1125 . At terminal 1130 , an antenna 1135 receives the downlink signal and provides the received signal to a receiver unit (RCVR) 1140 . Receiver unit 1140 conditions (eg, filters, amplifies, and downconverts) the received signal and digitizes the conditioned signal to obtain samples. A symbol demodulator 1145 demodulates and provides received pilot symbols to a processor 1150 for channel estimation. Symbol demodulator 1145 further receives frequency response estimates for the downlink from processor 1150, performs data demodulation on received data symbols to obtain data symbol estimates (which are estimates of transmitted data symbols), and provides the data symbol estimates to receive data processor 1155, which demodulates (eg, symbol demaps), deinterleaves, and decodes the data symbol estimates to recover the transmitted traffic data. The processing performed by symbol demodulator 1145 and receive data processor 1155 is the inverse of the processing performed by symbol modulator 1115 and transmit data processor 1110 at access point 1105, respectively.

On the uplink, a transmit data processor 1160 processes traffic data and provides data symbols. A symbol modulator 1165 receives and multiplexes data symbols and pilot symbols, performs modulation, and provides a stream of symbols. Transmitter unit 1170 then receives and processes the symbol stream to generate an uplink signal, which is sent to access point 1105 via antenna 1135 .

At access point 1105, the uplink signal from terminal 1130 is received by antenna 1125 and processed by receive unit 1175 to obtain samples. A symbol demodulator 1180 then processes the samples and provides received pilot symbols and data symbol estimates for the uplink. Receive data processor 1185 processes the data symbol estimates to recover the traffic data transmitted by terminal 1130 . Processor 1190 performs channel estimation for each active terminal transmitting on the uplink. Multiple terminals may simultaneously transmit pilot on the uplink on their respective assigned sets of pilot subbands, which may be interleaved.

Processors 1190 and 1150 direct (eg, control, coordinate, manage, etc.) the operation of access point 1105 and terminal 1130, respectively. Processors 1190 and 1150 can be associated with memory units (not shown) that store program codes and data, respectively. Processors 1190 and 1150 can also perform computations to obtain frequency response estimates and impulse response estimates for the uplink and downlink, respectively.

For a multiple-access system (eg, FDMA, OFDMA, CDMA, TDMA, etc.), multiple terminals can transmit on the uplink simultaneously. For such systems, pilot subbands can be shared among different terminals. Channel estimation techniques can be used where the pilot subbands for each terminal span the entire operating band (possibly except for the band edges). Such a pilot subband structure is required to obtain frequency diversity for each terminal. The techniques described here can be implemented in a variety of ways. For example, these techniques can be implemented in hardware, software, or a combination thereof. For hardware implementations, which may be digital, analog, or both, the processing unit for channel estimation may be implemented in one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices ( DSPD), programmable logic device (PLD), field programmable gate array (FPGA), processor, controller, microcontroller, microprocessor, other electronic units designed to perform the functions described herein, or their within the portfolio. With software, implementation can be through modules (eg, procedures, functions, and so on) that perform the functions described herein. The software codes may be stored in the memory unit and executed by the processors 1190 and 1150 .

It can be understood that the specific embodiments described herein can be realized by hardware, software, firmware, middleware, microcode or any combination of the above. For hardware implementation, the processing unit can be implemented in one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays ( FPGA), processors, controllers, microcontrollers, microprocessors, other electronic units designed to perform the functions described herein, or combinations thereof.

When the embodiments are implemented in software, firmware, middleware or microcode, program code or code segments, they may be stored on a machine-readable medium such as a storage unit. A code segment may represent a procedure, function, subroutine, program, routine, subroutine, module, package, class, or any combination of instructions, data structures, or program statements. A code segment can be coupled to another code segment or a hardware circuit by passing and/or receiving information, data, arguments, parameters, or memory. Information, arguments, parameters, data, etc. may be passed, forwarded or sent using any suitable method, including memory sharing, message passing, token passing, network transmission and the like.

For a software implementation, the techniques described herein can be implemented with modules (eg, procedures, functions, and so on) that perform the functions described herein. The software codes may be stored in memory units and executed by processors. The memory unit can be implemented within or external to the processor, in which case it can be communicatively coupled to the processor via various methods as is known in the art.

Reference is now made to FIG. 12, which illustrates a system 1200 that enables the use of flexible transmission modes in wireless communications. The system 1200 may include: a module 1202 for determining a time position of a subframe in which SFN transmission of data will occur; a module 1204 for determining a first transmission mode and a second transmission mode for a reference signal; module 1206 for: using Selecting a transmission mode to use between a first transmission mode and a second transmission mode for a reference signal based on whether SFN data will be sent in the subframe; module 1208 for, before using the selected transmission mode Broadcast information about the transport mode. Modules 1202 - 1208 may be processors or any electronic devices, and may be coupled to memory module 1210 .

Reference is now made to FIG. 13, which illustrates a system 1300 that enables the use of flexible transmission modes in wireless communications. System 1300 may include: a module 1302 for determining a time location of a subframe in which SFN transmission of data will occur; a module 1304 for determining a first transmission mode and a second transmission mode for a reference signal; module 1306 for determining a first transmission mode and a second transmission mode for a reference signal; Information about the selected transmission mode is broadcast before the transmission mode is used. Modules 1302 - 1306 may be processors or any electronic devices, and may be coupled to memory module 1308 .

Reference is now made to FIG. 14, which illustrates a system 1400 that enables the use of flexible transmission modes in wireless communications. System 1400 may include: module 1402 for using a first transmission mode, wherein the first transmission mode includes tones for sending a set of data according to a single frequency network (SFN) transmission scheme; module 1404 for using the first transmission mode Two transmission modes, wherein the second transmission mode includes a tone for sending a reference signal; module 1406, configured to broadcast information about the selected transmission mode before using the transmission mode. Modules 1402 - 1406 may be processors or any electronic devices and may be coupled to memory module 1408 .

Reference is now made to FIG. 15, which illustrates a system 1500 that enables the use of flexible transmission modes in wireless communications. The system 1500 may include: a module 1502 for receiving a time location of a subframe in which SFN transmission of data will occur; a module 1504 for receiving information about a first transmission mode, wherein the information includes at least one resource block at time and The location information on the frequency, the at least one resource block is used to send a set of data according to a single frequency network (SFN) transmission scheme. Modules 1502 - 1504 may be processors or any electronic devices, and may be coupled to memory module 1506 .

What has been described above includes examples of one or more aspects. It is of course not possible to describe every conceivable combination of components or methodologies for purposes of describing the various aspects mentioned above, but anyone of ordinary skill in the art would appreciate that further combinations and permutations of the various aspects are possible. Accordingly, the described aspects are intended to embrace all such alterations, improvements and modifications that fall within the scope of the appended claims. Additionally, to the extent the term "comprises" is used in the detailed description or in the claims, the term is intended to be non-exclusive, which is interpreted similarly to how the term "comprises" is used as a transitional term in the claims.

Claims (51)

1. method that is used for radio communication comprises:

Determine to occur the time location of the subframe that the single frequency network SFN to data transmits;

Be identified for the first transmission mode and second transmission mode of reference signal, wherein, the symbol and the tone that are used for reference signal of above-mentioned transmission mode indication subframe;

Based on whether will in this subframe, sending the SFN data, the transmission mode that selection will be used between this first transmission mode that is used for reference signal and the second transmission mode, wherein, if in this subframe, will not send the SFN data, then select to be used for the second transmission mode of reference signal, if and in this subframe, will send the SFN data, would then select to be used for the first transmission mode of reference signal; And

Before using selected transmission mode, broadcasting is about the information of selected transmission mode.

2. method as claimed in claim 1 also comprises:

Reception will occur to the time location of the subframe of the SFN of data transmission and about the information of this first and second transmission mode of being used for reference signal.

3. method as claimed in claim 1 also comprises:

Before this first and second transmission mode of using reference signal, broadcasting is about the information of this first and second transmission mode of reference signal.

4. method as claimed in claim 1 also comprises:

Be identified for sending the 3rd transmission mode of SFN data, wherein, the 3rd transmission mode comprises being assigned in the subframe and uses the SFN transmission plan to send the position of the tone of data.

5. method as claimed in claim 4, wherein, broadcasting comprises about the information of the 3rd transmission mode:

Send the positional information of one or more Resource Block on time and frequency that is used for sending with the SFN transmission plan data in this subframe.

6. method as claimed in claim 1, wherein, determine that this first transmission mode and this second transmission mode comprise:

Receive the parameter that is used for this first transmission mode and this second transmission mode.

7. method as claimed in claim 1, wherein, broadcast described information and comprise:

Be sent in the positional information of the Resource Block that is used for the SFN transmission on time and frequency in this subframe and the described time location that is allocated for this subframe of this SFN transmission.

8. method as claimed in claim 4, wherein, broadcast described information and comprise:

Transmission is allocated for the described time location of this subframe of this SFN transmission.

9. method as claimed in claim 1, wherein, determine that this first transmission mode comprises:

Receive the parameter of this first transmission mode.

10. method as claimed in claim 1, wherein, determine that this first transmission mode comprises:

From one group of transmission mode, select this first transmission mode.

11. such as the method for claim 10, wherein, select this first transmission mode to comprise:

Each symbol in the selection subframe comprises the first transmission mode for the data tones of SFN transmission.

12. such as the method for claim 10, wherein, the pattern of selecting to have one or more tones for pilot tone comprises:

The non-conterminous pattern of the tone of selecting this to be used for pilot tone.

13. such as the method for claim 10, wherein, the pattern of selecting to have one or more tones for pilot tone comprises:

The pattern that the tone of selecting this to be used for pilot tone is adjacent.

14. method as claimed in claim 1 also comprises:

Receive the indication execution to the indication of the SFN transmission of data.

15. method as claimed in claim 3 wherein, determines that this second transmission mode comprises:

Be chosen in and have the second transmission mode that is assigned to send according to the SFN transmission plan tone of data on each symbol of subframe.

16. a method that is used for radio communication comprises:

Determine to occur the time location of the subframe that the single frequency network SFN to data transmits;

Be identified for sending the first transmission mode of reference signal, wherein, this first transmission mode is included in the position of the tone that is allocated for the transmission reference signal in this subframe and the position of symbol;

Before using this first transmission mode, broadcast the information about this first transmission mode,

Wherein, described method further comprises:

Be identified for sending the SFN transmission mode of SFN data, wherein, this SFN transmission mode is included in being assigned in this subframe and uses the SFN transmission plan to send the position of the tone of data.

17. the method such as claim 16 also comprises:

Reception will occur to the time location of this subframe of the SFN of data transmission and about the information of this first transmission mode.

18. the method such as claim 16 also comprises:

Broadcasting is about the information of this SFN transmission mode before using this SFN transmission mode.

19. such as the method for claim 18, wherein, broadcasting comprises about the information of this SFN transmission mode:

Be sent in the positional information of one or more Resource Block on time and frequency that is used for sending this SFN the transmission of data in this subframe.

20. a method that is used for radio communication comprises:

Time location to the subframe of the single frequency network SFN transmission of data will occur in reception; And

Reception is about the information of the first transmission mode, and wherein, this information comprises for the positional information of at least one Resource Block on time and frequency that sends one group of data according to the SFN transmission plan,

Wherein, described method further comprises:

Determine whether current subframe comprises the data of using the SFN transmission plan to send.

21. such as the method for claim 20, wherein, the information that receives about the first transmission mode comprises:

Receive the positional information of at least one Resource Block on time and frequency that is used for sending reference signal.

22. the method such as claim 20 also comprises:

Process this Resource Block based on this first transmission mode.

23. the method such as claim 20 also comprises:

Receive indication and use the indication of the first transmission mode.

24. a method that is used for radio communication comprises:

Time location to the subframe of the single frequency network SFN transmission of data will occur in reception; And

Reception is about the information of the first transmission mode, and wherein, this information comprises the positional information of at least one Resource Block on time and frequency for the transmission reference signal,

Wherein, described method further comprises:

Determine whether current subframe comprises the data of using the SFN transmission plan to send.

25. the method such as claim 24 also comprises:

Receive indication and use the indication of the first transmission mode.

26. a device that is used for radio communication comprises:

Be used for to determine to occur the module of the time location of the subframe that the single frequency network SFN to data transmits;

Be used for being identified for the first transmission mode of reference signal and the module of the second transmission mode, wherein, the symbol and the tone that are used for reference signal of above-mentioned transmission mode indication subframe;

Be used for based on whether sending the SFN data in this subframe, the module of the transmission mode that selection will be used between this first transmission mode that is used for reference signal and the second transmission mode, wherein, if in this subframe, will not send the SFN data, then select to be used for the second transmission mode of reference signal, if and in this subframe, will send the SFN data, would then select to be used for the first transmission mode of reference signal; And

Be used for before using selected transmission mode, broadcasting is about the module of the information of selected transmission mode.

27. the device such as claim 26 also comprises:

Be used for to receive and to occur to the time location of the subframe of the SFN transmission of data and about the module for the information of this first and second transmission mode of reference signal.

28. the device such as claim 26 also comprises:

Be used for before this first and second transmission mode of using reference signal, broadcasting is about the module of the information of this first and second transmission mode of reference signal.

29. the device such as claim 26 also comprises:

Be used for being identified for sending the module of the 3rd transmission mode of SFN data, wherein, the 3rd transmission mode comprises being assigned in the subframe and uses the SFN transmission plan to send the position of the tone of data.

30. such as the device of claim 29, wherein, comprise for the module of broadcasting about the information of the 3rd transmission mode:

Be used for sending the module that is used for sending with the SFN transmission plan positional information of one or more Resource Block on time and frequency of data of this subframe.

31. such as the device of claim 26, be used for determining that the module of this first transmission mode and this second transmission mode comprises:

The module that is used for the parameter of this first transmission mode of reception and this second transmission mode.

32. such as the device of claim 26, wherein, comprise for the module of broadcasting described information:

The positional information of the Resource Block that is used for the SFN transmission that is used for being sent in this subframe on time and frequency and the module of described time location that is allocated for this subframe of this SFN transmission.

33. such as the device of claim 29, wherein, comprise for the module of broadcasting described information:

Be used for sending the module of the described time location of this subframe that is allocated for this SFN transmission.

34. such as the device of claim 26, wherein, be used for determining that the module of this first transmission mode comprises:

The module that is used for the parameter of this first transmission mode of reception.

35. such as the device of claim 26, wherein, be used for determining that the module of this first transmission mode comprises:

Be used for selecting from one group of transmission mode the module of this first transmission mode.

36. such as the device of claim 35, wherein, be used for selecting the module of this first transmission mode to comprise:

Each symbol that is used for the selection subframe comprises the module of the first transmission mode of the data tones of transmitting for SFN.

37. such as the device of claim 35, wherein, the module that has the pattern of one or more pilot tones for selection comprises:

Be used for selecting the module of the non-conterminous pattern of this pilot tones.

38. such as the device of claim 35, wherein, the module that has the pattern of one or more pilot tones for selection comprises:

Be used for selecting the module of the adjacent pattern of this pilot tones.

39. the device such as claim 26 also comprises:

Be used for receiving the indication execution to the module of the indication of the SFN transmission of data.

40. such as the device of claim 28, wherein, be used for determining that the module of this second transmission mode comprises:

Be used for being chosen in having on each symbol of subframe and be allocated for the module of the second transmission mode that sends the tone of data according to the SFN transmission plan.

41. a device that is used for radio communication comprises:

Be used for to determine to occur the module of the time location of the subframe that the single frequency network SFN to data transmits;

Be used for being identified for sending the module of the first transmission mode of reference signal, wherein, this first transmission mode is included in the position that is allocated for the tone that sends reference signal in this subframe and the position of symbol;

Be used for before using this first transmission mode, broadcasting the module about the information of this first transmission mode,

Wherein, described device further comprises:

Be used for being identified for sending the module of the SFN transmission mode of SFN data, wherein, this SFN transmission mode is included in being assigned in this subframe and uses the SFN transmission plan to send the position of the tone of data.

42. the device such as claim 41 also comprises:

Be used for to receive time location that the subframe that the SFN to data transmits will occur and about the module of the information of this first transmission mode.

43. the device such as claim 41 also comprises:

Be used for before using this SFN transmission mode, broadcasting the module about the information of this SFN transmission mode.

44. such as the device of claim 43, wherein, comprise for the module of broadcasting about the information of this SFN transmission mode:

Be used for being sent in the module for the positional information of one or more Resource Block on time and frequency that sends this SFN the transmission of data of this subframe.

45. a device that is used for radio communication comprises:

Be used for to receive the module of the time location that the subframe that the single frequency network SFN to data transmits will occur; And

Be used for to receive the module about the information of the first transmission mode, wherein, this information comprises for the positional information of at least one Resource Block on time and frequency that sends one group of data according to the SFN transmission plan,

Wherein, described device further comprises:

Be used for determining whether current subframe comprises the module of the data of using the transmission of SFN transmission plan.

46. such as the device of claim 45, wherein, comprise for the module of reception about the information of the first transmission mode:

Be used for receiving the module of the positional information of at least one Resource Block on time and frequency that is used for the transmission reference signal.

47. the device such as claim 45 also comprises:

Be used for processing based on this first transmission mode the module of this Resource Block.

48. the device such as claim 45 also comprises:

Be used for receiving the module that the indication of the first transmission mode is used in indication.

49. a device that is used for radio communication comprises:

Be used for to receive the module of the time location that the subframe that the single frequency network SFN to data transmits will occur; And

Be used for receiving the module about the information of the first transmission mode, wherein, this information comprises the positional information of at least one Resource Block on time and frequency for the transmission reference signal,

Wherein, described device further comprises:

Determine whether current subframe comprises the module of the data of using the transmission of SFN transmission plan.

50. the device such as claim 49 also comprises:

Be used for receiving the module that the indication of the first transmission mode is used in indication.

51. a method that is used for radio communication comprises:

Determine to occur the time location of the subframe that the single frequency network SFN to data transmits;

Be identified for sending the first transmission mode of reference signal, wherein, this first transmission mode is included in being allocated in this subframe and sends reference signal and be used for the position of tone of empty tone and the position of symbol;

Before using this first transmission mode, broadcast the information about this first transmission mode,

Wherein, described method further comprises:

Be identified for sending the SFN transmission mode of SFN data, wherein, this SFN transmission mode is included in being assigned in this subframe and uses the SFN transmission plan to send the position of the tone of data.

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