WO2014047915A1 - 参考信号发送和接收的方法和装置 - Google Patents

参考信号发送和接收的方法和装置 Download PDF

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Publication number
WO2014047915A1
WO2014047915A1 PCT/CN2012/082408 CN2012082408W WO2014047915A1 WO 2014047915 A1 WO2014047915 A1 WO 2014047915A1 CN 2012082408 W CN2012082408 W CN 2012082408W WO 2014047915 A1 WO2014047915 A1 WO 2014047915A1
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WIPO (PCT)
Prior art keywords
reference signal
subframes
bandwidth
granularity
received
Prior art date
Application number
PCT/CN2012/082408
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English (en)
French (fr)
Inventor
戴喜增
程型清
吴作敏
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP12885742.2A priority Critical patent/EP2903368B1/en
Priority to CN201280075888.4A priority patent/CN104770028B/zh
Priority to PCT/CN2012/082408 priority patent/WO2014047915A1/zh
Publication of WO2014047915A1 publication Critical patent/WO2014047915A1/zh
Priority to US14/671,556 priority patent/US20150200763A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0064—Rate requirement of the data, e.g. scalable bandwidth, data priority
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a method and apparatus for transmitting and receiving reference signals, and a terminal device.
  • BACKGROUND OF THE INVENTION Reducing a reference signal of a communication system can reduce the overhead of the communication system, thereby increasing system capacity. Reducing the reference signal overhead is an important means of reducing the overhead of the communication system.
  • the terminal device needs to use the reference signal to complete timing and synchronization tracking, and on this basis, the demodulation and decoding work can be performed normally. Timing and synchronization tracking algorithms require a certain amount of reference signal symbols. If the number of reference signal symbols is small, the terminal device cannot obtain good timing and synchronization tracking, and thus cannot guarantee good communication quality. Therefore, from the perspective of ensuring communication quality, it is necessary to provide a certain amount of reference signals to the terminal device.
  • the bandwidth used by modern communication systems is diverse.
  • the LTE (long term evolution) communication system provides six types of bandwidth, namely 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz and P 20 MHz.
  • To reduce the reference signal overhead of such a system it is necessary to consider the timing and synchronization tracking capability of the terminal device, and it is necessary to ensure a certain number of reference signals. This requires that when the bandwidth is small, the reference signal overhead cannot be reduced, or the reference signal overhead is minimized.
  • the present application provides a method and apparatus for transmitting and receiving reference signals to solve a large technical problem of reference signal overhead.
  • a method for transmitting and receiving a reference signal on the premise of saving reference signal overhead includes:
  • the reference signal symbol is transmitted only once every N subframes; when a certain relationship is not satisfied, the reference signal needs to be transmitted in all subframes, or M in every N subframes
  • the reference signal is transmitted on the subframes.
  • the bandwidth is When the ratio is satisfied, the reference signal can only be received once at the corresponding position on every N subframes; when the certain relationship is not satisfied, the reference can be received on all subframes or in M subframes in every N subframes. signal.
  • the duration of one subframe is lms, but other values are not excluded.
  • a method for adjusting the granularity of transmission and reception of a reference signal includes: when the bandwidth transmission is changed, the corresponding transmission reference signal granularity and the received reference signal granularity are also adjusted accordingly.
  • the embodiment of the invention provides a method of adjustment.
  • the transmitting device needs to indicate whether the reference device granularity of the terminal device has changed; the terminal device needs to receive the signaling, and may report the transmitting device after completing the reference signal granularity switching.
  • the sending device receives the report, or the set timer expires, it considers that the reference signal granularity switching has been completed and enters normal operation.
  • the present invention provides a set of signaling and signaling procedures.
  • the reference signal overhead saving transmitting apparatus includes: a first sending module, which sends a reference signal according to a reference signal sending method, and sends a reference signal and a signal in a bandwidth; when the bandwidth changes, according to the sending The reference signal switching method adjusts the reference signal transmission granularity;
  • a second sending module when the bandwidth changes, and the granularity of the sending reference signal changes, sending the indication signaling to indicate a change in the granularity of the reference signal of the terminal device;
  • the first processing module needs to wait after the granularity of the transmission reference signal changes, and after a certain time, perform subsequent processing; or
  • the first acquisition module After the first acquisition module receives the feedback of the reference signal receiving device, subsequent processing is performed.
  • a first acquiring module configured to receive a reference signal according to a method for receiving a reference signal; adjust a reference signal receiving granularity according to a receiving granularity adjusting method of the reference signal described above when the bandwidth changes; and a second acquiring module, configured to receive the indication reference Signaling of signal granularity changes, or for receiving signaling indicating a change in bandwidth, and a bandwidth before and after the change.
  • the first sending module is configured to use a feedback indication, indicating that the terminal device has completed switching of the received reference signal granularity.
  • FIG. 1 is a schematic diagram of a method for transmitting a reference signal by a transmitting device in different bandwidth situations according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a method for receiving a reference signal by a receiving device in different bandwidth situations according to an embodiment of the present invention
  • FIG. 3 is a schematic flowchart 1 of a corresponding granularity of a transmission reference signal when a bandwidth of a transmitting device is changed according to an embodiment of the present disclosure
  • FIG. 4 is a second schematic flowchart of a granularity of a corresponding transmission reference signal when a bandwidth of a transmitting device is changed according to an embodiment of the present disclosure
  • FIG. 5 is a schematic diagram of a process for receiving a reference signal granularity switching process when a bandwidth transmission is changed by a terminal device according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of a process for receiving a reference signal granularity switching process when a bandwidth transmission is changed by a terminal device according to an embodiment of the present invention
  • FIG. 7 is a schematic structural diagram of a reference signal sending apparatus according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of a reference signal receiving apparatus according to an embodiment of the present invention.
  • Reducing the reference signal of the communication system can reduce the overhead of the communication system, thereby increasing system capacity. Reducing the reference signal overhead is an important means of reducing the overhead of the communication system.
  • the terminal device needs to use the reference signal to complete timing and synchronization tracking, and on this basis, the demodulation and decoding work can be performed normally. Timing and synchronization tracking algorithms require a certain amount of reference signal symbols. If the number of reference signal symbols is higher If there is less, the terminal device cannot get good timing and synchronization tracking, and thus cannot guarantee good communication quality. Therefore, from the perspective of ensuring communication quality, it is necessary to provide a certain amount of reference signals to the terminal device.
  • the bandwidth used by modern communication systems is diverse.
  • the LTE (long term evolution) communication system provides six types of bandwidth, namely 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz and P 20 MHz.
  • To reduce the reference signal overhead of such a system it is necessary to consider the timing and synchronization tracking capability of the terminal device, and it is necessary to ensure a certain number of reference signals. This requires that when the bandwidth is small, the reference signal overhead cannot be reduced, or the reference signal overhead is minimized.
  • s ioi shows that when the communication bandwidth is greater than or equal to r, the granularity of the transmitted reference signal is one reference signal transmitted every N subframes; but when the bandwidth is less than; r, the granularity of the transmitted reference signal is The reference signal is transmitted on all subframes, or the reference signal is transmitted on M subframes in every N subframes.
  • S102 shows that when the communication bandwidth is greater than; r, the granularity of the transmitted reference signal is one reference signal transmitted every N subframes; but when the bandwidth is less than or equal to r, the granularity of the transmitted reference signal is that the reference signal is transmitted in all subframes. Or transmitting a reference signal on M subframes within every N subframes.
  • the typical X value is 5MHz or 25PRB, and 3MHz or 15PRB (corresponding to the bandwidth of LTE, the bandwidth of LTE includes 1.4MHz (6PRB), 3 MHz (15PRB), 5 MHz (25PRB), 10MHz (50PRB), 15 MHz (75PRB) and 20MHz (100PRB)), the typical N value is 5 subframes.
  • S102 gives that when the communication bandwidth is less than X, the granularity of the transmission reference signal cannot be reduced, that is, the reference signal is transmitted in all subframes, or the reference signal is transmitted every N subframes, where the value of M is such that it continues The time is less than the period of N subframes.
  • the beneficial effect of this transmission is that when the bandwidth is greater than or equal to X, the system can reduce the transmission granularity of the reference signal, effectively reducing the communication overhead, but at the same time ensuring a certain number of reference signals, thereby ensuring the performance of timing and synchronization tracking. .
  • the bandwidth is less than X, in order to ensure the performance of timing and synchronization tracking, the transmitting device has limited consideration to retain a certain number of reference signals, and the reference signal overhead is appropriately reduced while ensuring performance.
  • Such a transmission method achieves a good compromise between communication quality and reduced reference signal overhead.
  • the corresponding terminal device When receiving and using the reference signal, the corresponding terminal device needs to take into account the change of the granularity of the reference signal of the transmitting end, and adjust the granularity of the received reference signal accordingly.
  • S201 shows that when the communication bandwidth is greater than or equal to; ⁇ , the position of receiving the reference signal may be receiving the reference signal every N subframes; when the communication bandwidth is less than ⁇ , the terminal device The reference signal is received on all subframes for processing, or there are M chances to receive the reference signal on M subframes within every N subframes.
  • S202 shows that when the communication bandwidth is greater than ⁇ , the location of the reference signal may be received once every N subframes; when the communication bandwidth is less than or equal to ⁇ , the terminal device receives the reference signal in all subframes. Used for processing, or there are M chances to receive a reference signal on M subframes within every N subframes.
  • the corresponding typical X value is 5MHz or 25PRB, and 3MHz or 15PRB.
  • the typical value of N is 5 subframes.
  • the beneficial effect of this transmission is that when the bandwidth is greater than or equal to X, the system can reduce the transmission granularity of the reference signal, effectively reducing the communication overhead, but at the same time ensuring a certain number of reference signals, thereby ensuring the performance of timing and synchronization tracking. .
  • the bandwidth is less than X, in order to ensure the performance of timing and synchronization tracking, the receiving device can obtain more reference signals for timing and synchronization tracking, thereby achieving robust performance.
  • Such a receiving method can utilize as much reference signal resources as possible to ensure timing and synchronization tracking performance, thereby improving communication quality.
  • the transmission bandwidth may be reduced due to energy saving or other reasons.
  • the transmitting device needs to adjust the granularity of the transmission reference signal while adjusting the transmission bandwidth.
  • Figure 3 shows that when the bandwidth of the transmitting device (base station or base station set) is greater than or equal to the bandwidth to be smaller than the corresponding need to adjust the granularity of the transmission reference signal, the reference signal is transmitted once every N subframes, as shown in S301, switching The reference signal is transmitted on all subframes, or the reference signal is transmitted on M subframes in every N subframes, as shown in S304, where M is an integer greater than one.
  • the transmitting device needs to send signaling, which indicates that the granularity of the reference signal transmission of the terminal device has changed, or indicates that the bandwidth of the terminal device system has been changed, and notifies the bandwidth before and after the change, or changes the bandwidth, while switching the bandwidth and switching the granularity of the reference signal. Whether the degree exceeds; the corresponding threshold, such as
  • the terminal device can thus know, or infer, that the granularity of the transmitted reference signal has changed, thereby adjusting the granularity of the received reference signal.
  • the transmitting device adjusts the bandwidth and adjusts the granularity of the transmitted reference signal, it needs to wait for a certain time, because the terminal device needs a certain processing time to receive signaling and adjust the granularity of the received reference signal. While waiting, the sending device can start its own timer.
  • the transmitting device can consider that the terminal device receives the reference signal granularity switching has been completed; or, while waiting, The transmitting device waits for feedback from the terminal device until the receiving device receives all the feedback, and the transmitting device starts to perform normal operations on the new bandwidth, as shown in S305.
  • FIG. 4 shows that when the bandwidth of the transmitting device (base station or base station set) is smaller than the bandwidth to be greater than or equal to the corresponding granularity of the transmission reference signal, the reference signal is transmitted in all subframes, or every N subframes.
  • the reference signal is transmitted, as shown in S401, and is switched to transmit the reference signal every N subframes, as shown in S404, where the length of time corresponding to M is less than N subframes.
  • the transmitting device needs to send signaling, which indicates that the granularity of the reference signal transmission of the terminal device has changed, or indicates that the bandwidth of the terminal device system has been changed, and notifies the bandwidth before and after the change, or changes the bandwidth, while switching the bandwidth and switching the granularity of the reference signal. Whether the degree exceeds; the corresponding threshold, such as
  • the terminal device can thus know, or infer, that the granularity of the transmitted reference signal has changed, thereby adjusting the granularity of the received reference signal.
  • the transmitting device adjusts the bandwidth and adjusts the granularity of the transmitted reference signal, it needs to wait for a certain time, because the terminal device needs a certain processing time to receive signaling and adjust the granularity of the received reference signal. While waiting, the sending device can start its own timer.
  • the transmitting device can consider that the terminal device receives the reference signal granularity switching has been completed; or, while waiting, The transmitting device waits for feedback from the terminal device until the receiving device receives all the feedback, and the transmitting device starts to perform normal operations on the new bandwidth, as shown in S405.
  • Such a transmission switching procedure can obtain the beneficial effects of the transmission method described in FIG. 1, and in addition, ensures that the transmitting device can effectively adjust the granularity of the transmission reference signal when performing bandwidth switching.
  • the signaling indication is provided to the terminal device, which can effectively trigger the terminal device to adjust the granularity of the reference signal receiving in time, thereby ensuring the coordination between the sending device and the receiving device, and improving the communication effect.
  • the terminal device When receiving the reference signal, the terminal device needs to adjust the granularity of the received reference signal, and may need to notify the transmitting device that the granularity adjustment of the received reference signal has been completed.
  • the reference signal when the bandwidth of the terminal device is greater than or equal to the bandwidth to be smaller than the corresponding granularity of the received reference signal, the reference signal is received once every N subframes, as shown in S501, and switched to all subframes.
  • the reference signal may be received on the uplink, or there are M opportunities to receive the reference signal every N subframes, as shown in S504, where the length of time corresponding to M is less than N subframes.
  • the terminal device first receives the signaling indication of the sending device, that is, indicates that the granularity of the reference signal transmission of the terminal device has changed, or indicates that the bandwidth of the terminal device system is changed, and notifies the bandwidth before and after the change, or whether the degree of the bandwidth change exceeds the corresponding Threshold, as shown in S503.
  • the terminal device knows according to the signaling, or concludes that the granularity of the transmission reference signal has changed, thereby adjusting the granularity of the received reference signal.
  • the terminal device may need to feed back the transmitting device after completing the reference signal receiving granularity adjustment, that is, notifying the transmitting device that it has completed switching of the received reference signal granularity, as shown in S505. As shown in FIG.
  • the reference signal when the bandwidth of the terminal device is less than or equal to the corresponding granularity of the received reference signal, the reference signal may be received in all subframes, or there are M opportunities in every N subframes.
  • the reference signal may be received, as shown in S601, switched to receive the reference signal once every N subframes, as shown in S604, where M corresponds to a time length less than N subframes.
  • the terminal device first receives the signaling indication of the sending device, that is, indicates that the granularity of the reference signal transmission of the terminal device has changed, or indicates that the bandwidth of the terminal device system is changed, and notifies the bandwidth before and after the change, or whether the degree of the bandwidth change exceeds the corresponding Threshold, as shown in S603.
  • the terminal device knows according to the signaling, or concludes that the granularity of the transmission reference signal has changed, thereby adjusting the granularity of the received reference signal.
  • the terminal device may need to feed back the transmitting device after completing the reference signal receiving granularity adjustment, that is, notifying the transmitting device that it has completed switching of the received reference signal granularity, as shown in S605.
  • Such a receiving reference signal granularity switching procedure can obtain the beneficial effects of the transmitting method described in FIG. 2, and in addition, providing signaling indications to the terminal device can effectively trigger the terminal device to timely adjust the reference signal receiving granularity, thereby ensuring The sending device and the receiving device are coordinated to improve the communication effect.
  • Fig. 7 shows a structural diagram of a reference signal transmitting apparatus, which is composed of three parts, namely, a first transmitting module, a second transmitting module, and a first processing module.
  • the first sending module transmits the reference signal according to the reference signal sending method described above, and transmits the reference signal and the signal within the bandwidth; when the bandwidth changes, the reference signal transmission is adjusted according to the foregoing method for transmitting the reference signal switching.
  • a second sending module when the bandwidth changes, and the granularity of the sending reference signal changes, sending the indication signaling to indicate a change in the granularity of the reference signal of the terminal device;
  • the first processing module needs to wait after the granularity of the transmission reference signal changes, and after a certain time, perform subsequent processing; or
  • the first acquisition module After the first acquisition module receives the feedback of the reference signal receiving device, subsequent processing is performed.
  • each module supports the functions of the reference signal transmission and reference signal transmission granularity switching procedures described above.
  • Fig. 8 shows a structural diagram of a terminal device, which is composed of three parts, namely a first acquisition module, a second acquisition module, and a first transmission module.
  • a first acquiring module configured to receive a reference signal according to the foregoing method for receiving a reference signal; and when the bandwidth changes, adjust a reference signal receiving granularity according to the reference signal receiving granularity adjusting method described above;
  • a second acquiring module configured to receive signaling indicating a change in the granularity of the reference signal, or to receive signaling indicating a bandwidth change, and a pre-change bandwidth and a changed bandwidth.
  • the first sending module is configured to use a feedback indication, indicating that the terminal device has completed switching of the received reference signal granularity.
  • each module supports the functions of the reference signal receiving and reference signal receiving granularity switching procedures described above.
  • the whole system is composed of a transmitting device and a terminal device.
  • the transmitting device performs the switching of the reference signal transmission granularity according to the reference signal sending method and the switching method, as shown in FIG. 1, 3, and 4, respectively, and transmits Notify the terminal device of the change in the granularity of its reference signal.
  • the terminal device receives the granularity switching method according to the reference signal receiving method and the reference signal, respectively, as shown in FIG. 2, 5, and 6 respectively, completing the switching of the reference signal receiving and the reference signal receiving granularity, or completing The reference signal granularity is switched and notified to the transmitting device.
  • the reference signal transmission method, the reference signal transmission switching process, the transmitting device, the reference signal receiving method, the reference signal receiving switching process, and the terminal device described above can effectively reduce the reference signal overhead and ensure communication. quality.
  • the reference signal overhead reduction cannot be reduced indefinitely.
  • the reference signal overhead reduction needs to consider the performance of timing and synchronization tracking, Radio Resource Management (RRM), demodulation, channel measurement feedback, etc., where timing and Synchronous tracking requires a certain number of reference signals. This puts a high requirement on the small bandwidth system, that is, when the bandwidth is small, the reference signal cannot be greatly reduced.
  • RRM Radio Resource Management
  • the reference signal transmitting/receiving device can effectively reduce the reference signal overhead when the bandwidth is large, appropriately reduce the reference signal overhead when the bandwidth is small, ensure the communication quality, and
  • the transmitting and receiving ends can coordinate the switching of the reference signal granularity.
  • GSM Global System of Mobile communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • UMTS Universal Cloud Communication System
  • WiMAX Worldwide Interoperability for Microwave Access
  • a user equipment may be referred to as a terminal (Terminal), a mobile station (Mobile Station, simply referred to as “subframe”), and a mobile terminal (Mobile).
  • Terminal etc.
  • the user equipment can communicate with one or more core networks via a Radio Access Network (“RAN"), for example, the user equipment can be a mobile telephone (or “cellular” telephone Computers with mobile terminals, etc., for example, the user devices can also be portable, pocket-sized, handheld, computer-integrated or in-vehicle mobile devices that exchange voice and/or data with the wireless access network.
  • RAN Radio Access Network
  • the user equipment can be a mobile telephone (or "cellular" telephone Computers with mobile terminals, etc.
  • the user devices can also be portable, pocket-sized, handheld, computer-integrated or in-vehicle mobile devices that exchange voice and/or data with the wireless access network.
  • the base station may be a base station (Base Transceiver Station, referred to as "BTS”) in GSM or CDMA, or may be a base station (NodeB, referred to as "NB") in WCDMA, or may be in LTE.
  • BTS Base Transceiver Station
  • NodeB base station
  • the evolved base station (Evolutional Node B, referred to as "ENB or e-NodeB”) is not limited in the present invention. For convenience of description, the following embodiments will be described by taking a base station eNB and a user equipment UE as an example.
  • the disclosed apparatus, methods, and systems may be implemented by other methods.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division method for example, multiple units or modules may be combined or Can be integrated into another system, or some features can be ignored, or not executed.

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  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

本发明实施例提供一种参考信号发送、接收的方法和装置，以及终端设备。该方法包括当带宽满足给定条件时，只在每N个子帧发送或接收一次参考信号符号，当不满足给定条件时，需要增多参考信号的发送或接收。该方法还包括随带宽改变而对参考信号的发送或接收粒度进行的调整，以及调整过程中所需要的信令和流程。通过该方法和装置，可以在有效减小参考信号开销的同时，保证良好的通信质量，达到通信有效性和可靠性的良好折衷。

Description

参考信号发送和接收的方法和装置 技术领域 本发明涉及无线通信技术领域， 尤其涉及一种参考信号发送和接收的方法 和装置， 以及终端设备。 背景技术 减小通信***的参考信号可以降低通信***的开销， 从而提高***容量。 减小参考信号开销是降低通信***开销的重要手段。 但是终端设备需要使用参 考信号完成定时和同步跟踪， 在此基础之上才能正常的进行解调解码工作。 而 定时和同步跟踪算法需要一定量的参考信号符号。 如果参考信号符号的数量较 少， 则终端设备无法得到很好的定时和同步跟踪， 从而也无法保证良好的通信 质量。所以从保证通信质量的角度说， 需要给终端设备提供一定量的参考信号。
现代通信***使用的带宽是多种多样的， 例如 LTE ( long term evolution) 通信***提供了 6种带宽，即 1.4MHz，3MHz，5MHz， 10MHz, 15MHz禾 P 20MHz。 对这样的***进行参考信号开销的减少， 需要考虑终端设备的定时和同步跟踪 能力， 需要保证一定的参考信号数量。 这就要求当带宽较小的时候， 不能进行 参考信号开销的减少， 或尽量少减小参考信号开销。
所以考虑到终端设备的处理能力和保证通信质量， 进行参考信号开销减少 时需要根据带宽来选择合适的参考信号粒度， 而不能对所有情况， 例如带宽不 同， 都使用同样的参考信号开销减小方法。 发明内容 本申请提供了一种参考信号发送和接收的方法和装置， 以解决参考信号开 销较大技术问题。
本发明实施例一方面提供的在节省参考信号开销前提下发送和接收参考信 号的方法， 包括：
当发送带宽与 Γ相比满足一定关系时， 只在每 N个子帧发送一次参考信号 符号； 当不满足一定关系时， 需要在全部子帧上发送参考信号， 或者在每 N个 子帧内的 M个子帧上发送参考信号。 相应的终端设备在接收时， 当带宽与； Γ相 比满足一定关系时， 只能在每 N个子帧上相应的位置接收一次参考信号； 当不 满足一定关系时， 可以在全部子帧上， 或者在每 N个子帧内的 M个子帧上接收 参考信号。 这里， 一个子帧的持续时间为 lms， 但不排除其他的数值。
本发明实施例另一方面提供的参考信号的发送和接收粒度调整方法，包括： 当带宽发送改变， 相应的发送参考信号粒度和接收参考信号粒度也要做相 应的调整。 本发明实施例给出了调整的方法。
伴随着参考信号粒度的调整， 发送设备需要指示终端设备参考信号粒度是 否发生了变化； 终端设备需要接收这个信令， 并可能在完成参考信号粒度切换 后上报发送设备。 发送设备在接收到上报， 或设定的定时器超时时， 认为参考 信号粒度切换已经完成， 进入正常工作。 本发明给出了一套信令和信令流程。
本发明实施例再一方面提供的参考信号开销节省发送装置， 包括： 第一发送模块， 根据参考信号发送方法发送参考信号， 在带宽内发送参考 信号和信号； 在带宽发生变化时， 根据的发送参考信号切换方法调整参考信号 发送粒度；
第二发送模块， 在带宽发生变化， 并且发送参考信号粒度发生变化时， 发 送指示信令指示终端设备参考信号粒度的变化；
第一处理模块， 在发送参考信号粒度发生变化后， 需要等待， 当达到一定 的时间后， 进行后续处理； 或者
在第一获取模块接收到参考信号接收装置的反馈后， 进行后续处理。
本发明实施例再一方面提供的终端设备， 包括：
第一获取模块， 用于根据接收参考信号的方法接收参考信号； 在带宽发生 变化时，根据前面描述的参考信号的接收粒度调整方法调整参考信号接收粒度； 第二获取模块， 用于接收指示参考信号粒度变化的信令， 或者用于接收指 示带宽变化， 以及变化前带宽和变化后带宽的信令。
第一发送模块， 用于反馈指示， 表明终端设备已经完成了接收参考信号粒 度的切换。
通过本发明实施例所述的方法， 在带宽大于等于 X时， ***可以通过降低 参考信号发送粒度， 有效的降低了通信开销。 附图说明 为了更清楚地说明本发明实施例或现有技术中的技术方案， 下面将对实施 例或现有技术描述中所需要使用的附图作简单地介绍， 显而易见地， 下面描述 中的附图仅仅是本发明的一些实施例， 对于本领域普通技术人员来讲， 在不付 出创造性劳动的前提下， 还可以根据这些附图获得其他的附图。
图 1为本发明实施例提供的不同带宽情况下发射装置发送参考信号的方法 示意图；
图 2为本发明实施例提供的不同带宽情况下接收装置接收参考信号的方法 示意图；
图 3为本发明实施例提供的发送装置带宽发生变化时相应的发送参考信号 粒度切换的流程示意图一；
图 4为本发明实施例提供的发送装置带宽发生变化时相应的发送参考信号 粒度切换的流程示意图二；
图 5为本发明实施例提供的终端设备在带宽发送变化时接收参考信号粒度 切换流程意图一；
图 6为本发明实施例提供的终端设备在带宽发送变化时接收参考信号粒度 切换流程意图二；
图 7为本发明实施例提供的参考信号发送装置构造示意图。
图 8为本发明实施例提供的参考信号接收装置构造示意图。
具体实施方式 下面将结合本发明实施例中的附图， 对本发明实施例中的技术方案进行清 楚、 完整地描述， 显然， 所描述的实施例仅仅是本发明一部分实施例， 而不是 全部的实施例。 基于本发明中的实施例， 本领域普通技术人员在没有做出创造 性劳动前提下所获得的所有其他实施例， 都属于本发明保护的范围。
减小通信***的参考信号可以降低通信***的开销， 从而提高***容量。 减小参考信号开销是降低通信***开销的重要手段。 但是终端设备需要使用参 考信号完成定时和同步跟踪， 在此基础之上才能正常的进行解调解码工作。 而 定时和同步跟踪算法需要一定量的参考信号符号。 如果参考信号符号的数量较 少， 则终端设备无法得到很好的定时和同步跟踪， 从而也无法保证良好的通信 质量。所以从保证通信质量的角度说， 需要给终端设备提供一定量的参考信号。
现代通信***使用的带宽是多种多样的， 例如 LTE ( long term evolution) 通信***提供了 6种带宽，即 1.4MHz，3MHz，5MHz， 10MHz, 15MHz禾 P 20MHz。 对这样的***进行参考信号开销的减少， 需要考虑终端设备的定时和同步跟踪 能力， 需要保证一定的参考信号数量。 这就要求当带宽较小的时候， 不能进行 参考信号开销的减少， 或尽量少减小参考信号开销。
所以考虑到终端设备的处理能力和保证通信质量， 进行参考信号开销减少 时需要根据带宽来选择合适的参考信号粒度。
如图 1所示， s ioi给出了当通信带宽大于或等于； r时， 发送参考信号的粒 度为每 N 个子帧发送一次参考信号； 但带宽小于； r时， 发送参考信号的粒度为 在全部子帧上发送参考信号，或者在每 N个子帧内的 M个子帧上发送参考信号。 S 102给出了当通信带宽大于； r时， 发送参考信号的粒度为每 N 个子帧发送一 次参考信号； 但带宽小于或者等于 r时， 发送参考信号的粒度为在全部子帧上 发送参考信号， 或者在每 N个子帧内的 M个子帧上发送参考信号。 其中根据理 论分析和实践， 典型的 X取值为 5MHz或 25PRB , 以及 3MHz或 15PRB (对应 于 LTE的带宽， LTE的带宽包括 1.4MHz ( 6PRB ) ， 3 MHz ( 15PRB ) ， 5 MHz ( 25PRB ) ， 10MHz ( 50PRB ) ， 15 MHz ( 75PRB ) 禾口 20MHz ( 100PRB ) ) ， 典型的 N取值为 5个子帧。 S 102给出的是当通信带宽小于 X时， 发送参考信 号的粒度不能减少， 即在全部子帧上都发送参考信号， 或者每 N 个子帧发送参 考信号， 其中 M的取值是使其持续时间小于周期 N 个子帧。
这样发送的有益效果是， 在带宽大于等于 X时， ***可以通过降低参考信 号发送粒度， 有效的降低了通信开销， 但同时又保证了一定的参考信号数量， 从而保证了定时和同步跟踪的性能。 当带宽小于 X的时候， 为了保证定时和同 步跟踪的性能， 发送设备有限考虑保留一定参考信号数量， 在保证性能的同时， 适当降低参考信号开销。 这样的发送方法达到了通信质量和降低参考信号开销 一个较好的折衷。
相应的终端设备在接收和使用参考信号时， 需要考虑到发送端参考信号粒 度的变化， 而相应的调整接收参考信号的粒度。
如图 2所示， S201给出了当通信带宽大于或等于； Γ时， 接收参考信号的位 置可以是在每 N个子帧上接收一次参考信号； 当通信带宽小于 Γ时， 终端设备 在所有的子帧上接收参考信号用于处理，或者在每 N个子帧内的 M个子帧上有 M次机会来接收参考信号。 S202给出了当通信带宽大于； Γ时， 接收参考信号的 位置可以是在每 N个子帧上接收一次参考信号；当通信带宽小于或者等于 Γ时， 终端设备在所有的子帧上接收参考信号用于处理，或者在每 N个子帧内的 M个 子帧上有 M次机会来接收参考信号。 其中相应的典型的 X 取值为 5MHz 或 25PRB , 以及 3MHz或 15PRB , 典型的 N的取值为 5个子帧。 S202给出的是， 其中 N和 M的取值同图 1的相关描述。
这样发送的有益效果是， 在带宽大于等于 X时， ***可以通过降低参考信 号发送粒度， 有效的降低了通信开销， 但同时又保证了一定的参考信号数量， 从而保证了定时和同步跟踪的性能。 当带宽小于 X的时候， 为了保证定时和同 步跟踪的性能， 接收设备可以获得更多的参考信号用于定时和同步跟踪， 从而 达到鲁棒的性能。 这样的接收方法可以利用尽可能多的参考信号资源保证定时 和同步跟踪性能， 从而提高通信质量。
发送设备在工作过程中， 因为节能或其他原因可能会减低传输带宽， 此时 当发送设备还进行了参考信号开销减小， 发送设备在发送带宽调整的同时还需 要调整发送参考信号的粒度。
图 3给出了当发送设备 （基站或基站集合） 的带宽由大于或等于 切换 到带宽小于 相应的需要调整发送参考信号的粒度， 由每 N个子帧发送一次 参考信号， 如 S301 所示， 切换到在全部子帧上都发送参考信号， 或者在每 N 个子帧内的 M个子帧上发送参考信号，如 S304所示，其中 M为大于 1的整数。 发送设备在切换带宽和切换发送参考信号粒度的同时， 需要发送信令， 指示终 端设备参考信号发送粒度发生了改变，或者指示终端设备***带宽发送了改变， 并通知改变前后的带宽， 或者带宽改变的程度是否超过了； Γ所对应的门限， 如
S303所示。终端设备由此可以知道，或者推断出发送参考信号粒度发生了改变， 从而调整接收参考信号粒度。 发送设备在调整带宽， 调整发送参考信号粒度后， 需要等待一定的时间， 因为终端设备接收信令以及调整接收参考信号粒度需要 一定的处理时间。 在等待时， 发送设备可以启动自己的计时器， 当计时器从切 换或者发送切换指令开始， 到 L 个子帧结束， 发送设备可以认为终端设备接收 参考信号粒度切换已经完成； 或者， 在等待时， 发送设备一直等待终端设备的 反馈， 直到接收到全部的反馈后， 发送设备才开始在新的带宽上进行正常的操 作， 如 S305所示。 图 4给出了当发送设备 （基站或基站集合） 的带宽由带宽小于 切换到 大于或等于 相应的需要调整发送参考信号的粒度， 由在全部子帧上都发送 参考信号， 或者每 N个子帧发送参考信号， 如 S401所示， 切换到每 N个子帧 发送一次参考信号， 如 S404所示， 其中 M对应的时间长度小于 N个子帧。 发 送设备在切换带宽和切换发送参考信号粒度的同时， 需要发送信令， 指示终端 设备参考信号发送粒度发生了改变， 或者指示终端设备***带宽发送了改变， 并通知改变前后的带宽， 或者带宽改变的程度是否超过了； Γ所对应的门限， 如
S403所示。终端设备由此可以知道，或者推断出发送参考信号粒度发生了改变， 从而调整接收参考信号粒度。 发送设备在调整带宽， 调整发送参考信号粒度后， 需要等待一定的时间， 因为终端设备接收信令以及调整接收参考信号粒度需要 一定的处理时间。 在等待时， 发送设备可以启动自己的计时器， 当计时器从切 换或者发送切换指令开始， 到 J 个子帧结束， 发送设备可以认为终端设备接收 参考信号粒度切换已经完成； 或者， 在等待时， 发送设备一直等待终端设备的 反馈， 直到接收到全部的反馈后， 发送设备才开始在新的带宽上进行正常的操 作， 如 S405所示。
这样的发送切换流程可以获得图 1所述的发送方法的有益效果，除此以外， 保证了发送设备在进行带宽切换时， 可以有效的调整发送参考信号的粒度。 同 时向终端设备提供信令指示， 可以有效的触发终端设备及时进行参考信号接收 粒度的调整， 从而保证发送设备和接收设备协调一致， 提高通信的效果。
终端设备在接收参考信号的时候， 需要调整接收参考信号的粒度， 并且有 可能需要通知发送设备， 接收参考信号粒度调整已经完成。
如图 5所示， 当终端设备的带宽由大于或等于 切换到带宽小于 相 应的需要调整接收参考信号的粒度， 由每 N个子帧接收一次参考信号，如 S501 所示， 切换到在全部子帧上都可以接收参考信号， 或者每 N 个子帧有 M个机 会可以接收参考信号， 如 S504所示， 其中 M对应的时间长度小于 N 个子帧。 终端设备首先接收发送设备的信令指示， 即指示终端设备参考信号发送粒度发 生了改变， 或者指示终端设备***带宽发送了改变， 并通知改变前后的带宽， 或者带宽改变的程度是否超过了 所对应的门限， 如 S503 所示。 终端设备根 据信令知道， 或者推断出发送参考信号粒度发生了改变， 从而调整接收参考信 号粒度。 终端设备在完成参考信号接收粒度调整后可能需要反馈发送设备， 即 通知发送设备其已经完成接收参考信号粒度的切换， 如 S505所示。 如图 6所示， 当终端设备的带宽由带宽小于 切换到大于或等于 相 应的需要调整接收参考信号的粒度， 由在全部子帧上都可以接收参考信号， 或 者每 N 个子帧有 M个机会可以接收参考信号， 如 S601所示， 切换到每 N 个 子帧接收一次参考信号，如 S604所示，其中 M对应的时间长度小于 N个子帧。 终端设备首先接收发送设备的信令指示， 即指示终端设备参考信号发送粒度发 生了改变， 或者指示终端设备***带宽发送了改变， 并通知改变前后的带宽， 或者带宽改变的程度是否超过了 所对应的门限， 如 S603 所示。 终端设备根 据信令知道， 或者推断出发送参考信号粒度发生了改变， 从而调整接收参考信 号粒度。 终端设备在完成参考信号接收粒度调整后可能需要反馈发送设备， 即 通知发送设备其已经完成接收参考信号粒度的切换， 如 S605所示。
这样的接收参考信号粒度切换流程可以获得图 2所述的发送方法的有益效 果， 除此以外， 向终端设备提供信令指示， 可以有效的触发终端设备及时进行 参考信号接收粒度的调整， 从而保证发送设备和接收设备协调一致， 提高通信 的效果。
图 7给出了参考信号发送装置的结构图， 该装置由三部分组成， 即第一发 送模块， 第二发送模块， 第一处理模块。
第一发送模块， 如 71所示， 根据前面描述的参考信号发送方法发送参考信 号， 在带宽内发送参考信号和信号； 在带宽发生变化时， 根据前面描述的发送 参考信号切换方法调整参考信号发送粒度；
第二发送模块， 在带宽发生变化， 并且发送参考信号粒度发生变化时， 发 送指示信令指示终端设备参考信号粒度的变化；
第一处理模块， 在发送参考信号粒度发生变化后， 需要等待， 当达到一定 的时间后， 进行后续处理； 或者
在第一获取模块接收到参考信号接收装置的反馈后， 进行后续处理。
这样的发送设备的有益效果是， 各个模块支持了前面所描述的参考信号发 送和参考信号发送粒度切换流程的功能。
图 8给出了终端设备装置的结构图， 该装置由三部分组成， 即第一获取模 块， 第二获取模块， 第一发送模块。
第一获取模块， 用于根据前面描述的接收参考信号方法接收参考信号； 在 带宽发生变化时， 根据前面描述的参考信号接收粒度调整方法调整参考信号接 收粒度； 第二获取模块， 用于接收指示参考信号粒度变化的信令， 或者用于接收指 示带宽变化， 以及变化前带宽和变化后带宽的信令。
第一发送模块， 用于反馈指示， 表明终端设备已经完成了接收参考信号粒 度的切换。
这样的接收设备的有益效果是， 各个模块支持了前面所描述的参考信号接 收和参考信号接收粒度切换流程的功能。
整个***由发送设备和终端设备组成， 当***带宽发送变化的时候， 发送 设备根据参考信号发送方法和切换方法， 分别由图 1,3， 4所示， 完成参考信号 发送粒度的切换， 并且发送通知给终端设备， 指示其参考信号粒度的变化。 在 收到参考信号发送粒度通知后， 终端设备根据参考信号接收方法和参考信号接 收粒度切换方法， 分别有图 2,5,6所示， 完成参考信号接收和参考信号接收粒度 的切换， 或者完成参考信号粒度切换并通知发送设备。
整体而言， 前面所描述的参考信号发送方法， 参考信号发送切换流程， 发 送设备， 参考信号接收方法， 参考信号接收切换流程， 和终端设备， 可以有效 的完成参考信号开销减小， 同时保证通信质量。 参考信号开销减小不能无限制 的减小， 参考信号开销减小需要考虑定时和同步跟踪的性能， 无线资源管理 ( Radio Resource Management, 简称 RRM) ， 解调， 信道测量反馈等性能， 其 中定时和同步跟踪需要一定数量的参考信号。 这样对小带宽***提出了较高的 要求， 即当带宽较小的时候， 参考信号不能大量的减少。 以上描述的参考信号 发送 /接收方法， 参考信号发送 /接收设备， 可以在带宽较大的时候有效的降低参 考信号开销， 在带宽较小的时候适当减小参考信号开销， 保证通信质量， 并且 在带宽发生变化的时候， 发送和接收端可以协调一致的完成参考信号粒度的切 换。
应理解， 本发明实施例的技术方案可以应用于各种通信***， 例如： 全球 移动通讯 ( Global System of Mobile communication, 简称为 " GSM" ) ***、 码 分多址 （Code Division Multiple Access, 简称为 " CDMA" ) ***、 宽带码分多 址 （Wideband Code Division Multiple Access, 简称为 " WCDMA" ) ***、 通用 分组无线业务（General Packet Radio Service,简称为 " GPRS" )、长期演进（Long Term Evolution，简称为" LTE" )***、 LTE频分双工（Frequency Division Duplex, 简称为 " FDD" )***、 LTE时分双工 ( Time Division Duplex, 简称为 " TDD" )、 通用移云力通信*** ( Universal Mobile Telecommunication System， 简称为 " UMTS" ) 、 全球互联微波接入 （Worldwide Interoperability for Microwave Access , 简称为 " WiMAX" ) 通信***等。
还应理解， 在本发明实施例中， 用户设备（User Equipment , 简称为 " UE" ) 可称之为终端 （Terminal ) 、 移动台 （Mobile Station, 简称为 "个子帧"） 、 移 动终端 （Mobile Terminal ) 等， 该用户设备可以经无线接入网 （Radio Access Network, 简称为 " RAN" ) 与一个或多个核心网进行通信， 例如， 用户设备可 以是移动电话 （或称为 "蜂窝" 电话） 、 具有移动终端的计算机等， 例如， 用 户设备还可以是便携式、 袖珍式、 手持式、 计算机内置的或者车载的移动装置， 它们与无线接入网交换语音和 /或数据。
在本发明实施例中，基站可以是 GSM或 CDMA中的基站（Base Transceiver Station ,简称为 " BTS" )，也可以是 WCDMA中的基站（NodeB ,简称为 " NB" )， 还可以是 LTE中的演进型基站（Evolutional Node B，简称为" ENB或 e-NodeB" )， 本发明并不限定。 但为描述方便， 下述实施例将以基站 eNB和用户设备 UE为 例进行说明。
在本申请所提供的几个实施例中， 应该理解到在本申请所提供的几个实施 例中， 应该理解到， 所揭露的装置、 方法和***， 可以通过其它的方法实现。 例如， 以上所描述的装置实施例仅仅是示意性的， 例如， 所述单元的划分， 仅 仅为一种逻辑功能划分， 实际实现时可以有另外的划分方法， 例如多个单元或 模块可以结合或者可以集成到另一个***， 或一些特征可以忽略， 或不执行。
本领域普通技术人员可以理解： 实现上述方法实施例的全部或部分步骤可 以通过程序指令相关的硬件来完成， 前述的程序可以存储于一计算机可读取存 储介质中， 该程序在执行时， 执行包括上述方法实施例的步骤； 而前述的存储 介质包括： ROM、 RAM, 磁碟或者光盘等各种可以存储程序代码的介质。
以上所述， 仅为本发明的具体实施方法， 但本发明的保护范围并不局限于 此， 任何熟悉本技术领域的技术人员在本发明揭露的技术范围内， 可轻易想到 变化或替换， 都应涵盖在本发明的保护范围之内。 因此， 本发明的保护范围应 以所述权利要求的保护范围为准。

Claims

权利要求
1、 一种参考信号发送的方法， 其特征在于， 包括：
当***带宽大于或等于 r时，在每 N个子帧内的一个子帧上发送参考信号， 其中 N为大于 1 的整数； 当***带宽小于； Γ时， 在每 N个子帧内的 M个子帧 上发送参考信号， 其中 M为大于 1的整数； 或者
当***带宽大于 Γ时， 在每 N个子帧内的一个子帧上发送参考信号， 其中 N为大于 1的整数； 当***带宽小于或等于 Γ时， 在每 N个子帧内的 M个子帧 上发送参考信号， 其中 M为大于 1的整数。
2、 根据权利要求 1所述的方法， 其特征在于： 当带宽发生变化时， 需要调 整参考信号发送的粒度，
当带宽由小于 Γ变化到大于或者等于 参考信号发送由每 N个子帧内的 M个子帧上发送参考信号，改变为在每 N个子帧内的一个子帧上发送参考信号； 当带宽由大于或者等于 Γ变化到小于 参考信号由在每 N个子帧内的一 个子帧上发送参考信号， 改变为在每 N个子帧内的 M个子帧上发送参考信号。
3、 根据权利要求 1所述的方法， 其特征在于： 当带宽发生变化时， 需要调 整参考信号发送的粒度，
当带宽由小于或者等于 Γ变化到大于 参考信号发送由在每 N个子帧内 的 M个子帧上发送参考信号，改变为在每 N个子帧内的一个子帧上发送参考信 号；
当带宽由大于 Γ变化到小于或者等于 参考信号由在每 N个子帧内的一 个子帧上发送参考信号， 改变为在每 N个子帧内的 M个子帧上发送参考信号。
4、 根据权利要求 1至权利要求 3任一项所述的方法， 其特征在于， X的取 值是以下之一：
=25PRB或等于带宽 5MHz;
= 15PRB或等于带宽 3MHz;
=6PRB或等于带宽 1.4MHz。
5、 根据权利要求 1至权利要求 3任一项所述的方法， 其特征在于： N=5 X k, M >1并且 M≤N， 其中 为整数。
6、 根据权利要求 1至权利要求 3任一项所述的方法， 其特征在于： 当带宽 发生变化， 并需要调整参考信号发送粒度时， 需要发送信令指示，
发送信令指示发生了参考信号粒度的变化； 或者
发送信令指示带宽变化， 以及变化前的带宽和变化后的带宽。
7、 根据权利要求 6所述的方法， 其特征在于： 在发送信令指示参考信号粒 度发生变化后， 需要等待 J个子帧， 参考信号粒度切换生效。
8、 根据权利要求 7所述的方法， 其特征在于： L 1。
9、 一种参考信号接收的方法， 其特征在于， 包括：
当带宽大于或等于 Γ时， 在每 N个子帧内可以接收一次参考信号； 当带宽 小于； Γ时， 在全部子帧上都可以接收参考信号， 或者在每 N 个子帧内的 M个 子帧上可以接收参考信号， 其中 M为大于 1的整数；
或者
带宽大于 Γ时， 在每 N个子帧内可以接收一次参考信号； 当带宽小于或等 于； Γ时， 在全部子帧上都可以接收参考信号， 或者在每 N 个子帧内的 M个子 帧上可以接收参考信号， 其中 M为大于 1的整数。
10、 根据权利要求 9所述的方法， 其特征在于， 当带宽发生变化时， 需要 调整接收参考信号的粒度，
当带宽由小于 Γ变化到大于或者等于 参考信号接收粒度由在全部子帧 上都可以接收， 或者在每 N子帧内的 M个子帧上可以接收参考信号， 改变为可 以在每 N 个子帧上接收一次参考信号；
当带宽由大于或者等于 Γ变化到小于 参考信号接收粒度由可以在每 N 个子帧接收一次参考信号， 改变为在全部子帧上都可以接收， 或者在每 N个子 帧内的 M个子帧上接收参考信号。
1 1、 根据权利要求 9所述的方法， 其特征在于， 当带宽发生变化时， 需要 调整接收参考信号的粒度，
当带宽由小于或者等于 Γ变化到大于 参考信号接收粒度由在全部子帧 上都可以接收， 或者在每 N子帧内的 M个子帧上可以接收参考信号， 改变为可 以在每 N 个子帧上接收一次参考信号；
当带宽由大于 Γ变化到小于或者等于 参考信号接收粒度由可以在每 N 个子帧接收一次参考信号， 改变为在全部子帧上都可以接收， 或者在每 N个子 帧内的 M个子帧上接收参考信号。
12、 根据权利要求 9至权利要求 1 1任一项所述的方法， 其特征在于， X的 取值是以下之一：
=25PRB或等于带宽 5MHz;
= 15PRB或等于带宽 3MHz; =6PRB或等于带宽 1.4MHz。
13、 根据权利要求 9至权利要求 1 1任一项所述的方法， 其特征在于： N=5 X k, M >1并且 M≤N， 其中 为整数。
14、根据权利要求 9至权利要求 1 1任一项所述的方法， 接收终端根据指示 判断是否需要调整参考信号接收粒度， 其特征在于：
根据接收的信令直接判断接收参考信号粒度是否发生变化； 或者
根据接收到的带宽变化前带宽， 和变化后的带宽， 判断是否接收参考信号 粒度发生变化。
15、 根据权利要求 14所述的方法， 其特征在于： 接收终端在接收到指示， 并判断接收参考信号粒度需要发生变化后， 需要等待 J个子帧， 接收参考信号 粒度切换生效。
16、 根据权利要求 15所述的方法， 其特征在于： L 1。
17、 根据权利要求 9到权利要求 16任一项所述的方法， 其特征在于： 在载 波聚合场景下， 当从一个载波， 切换到另外一个载波， 需要判断切换前和切换 后的带宽是否发生变换， 如果发生变化， 则需要根据权利要求 10 或权利要求 1 1所述的方法调整参考信号接收粒度。
18、 一种参考信号发送装置， 其特征在于， 所述装置根据权利要求 1 到权 利要求 8任一项所述的方法发送参考信号。
19、 根据权利要求 18所述的装置， 其特征在于， 所述装置包括： 第一发送模块， 根据权利要求 1所述的方法， 在带宽内发送参考信号和其 他信号； 在带宽发生变化时， 根据权利要求 2或权利要求 3所述的方法调整参 考信号发送粒度；
第二发送模块， 在带宽发生变化， 并且发送参考信号粒度发生变化时， 根 据权利要求 6所述的方法发送指示信令；
第一处理模块， 在发送参考信号粒度发生变化后， 根据权利要求 6所述的 方法等待， 当达到权利要求 7或权利要求 8所规定的时间后， 进行后续处理； 或者
在第一获取模块接收到参考信号接收装置的反馈后， 进行后续处理。
20、 根据权利要求 19所述的装置， 其特征在于，
当第二发送模块发送指示信令后， 第一处理模块启动定时器， 定时器的设 定时间满足权利要求 7或权利要求 8。
21、 一种终端设备， 其特征在于， 所述终端设备根据权利要求 9到权利要 求 17任一项所述的方法， 接收参考信号。
22、根据权利要求 21所述的终端设备，其特征在于，所述的终端设备包括： 第一获取模块， 用于根据权利要求 9所述的方法接收参考信号； 在带宽发 生变化时，根据权利要求 10或权利要求 1 1所述的方法调整参考信号接收粒度； 第二获取模块， 用于根据权利要求 14所述的方法， 接收指示参考信号粒度 变化的信令， 或者用于接收指示带宽变化， 以及变化前带宽和变化后带宽的信 令；
第一发送模块， 用于反馈指示， 表明终端设备已经完成了接收参考信号粒 度的切换。
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