WO2013044771A1 - Procédé et dispositif de transmission d'informations de commande de liaison descendante - Google Patents

Procédé et dispositif de transmission d'informations de commande de liaison descendante Download PDF

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Publication number
WO2013044771A1
WO2013044771A1 PCT/CN2012/081841 CN2012081841W WO2013044771A1 WO 2013044771 A1 WO2013044771 A1 WO 2013044771A1 CN 2012081841 W CN2012081841 W CN 2012081841W WO 2013044771 A1 WO2013044771 A1 WO 2013044771A1
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Prior art keywords
terminal device
downlink control
control information
network side
occupied
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PCT/CN2012/081841
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English (en)
Chinese (zh)
Inventor
徐伟杰
邢艳萍
贾民丽
陈东
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电信科学技术研究院
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Publication of WO2013044771A1 publication Critical patent/WO2013044771A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18—Negotiating wireless communication parameters
    • H04W28/20—Negotiating bandwidth
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method and a device for transmitting downlink control information. Background technique
  • M2M (Machine-to-machine) communication is a new communication concept. Its purpose is to combine many different types of communication technologies, such as: machine-to-machine communication, machine control communication, human-computer interaction communication, Mobile internet communication to promote social production and lifestyle development. It is expected that the business of human-to-human communication in the future may only account for 1/3 of the entire terminal market, and a larger amount of communication is the inter-machine (small bandwidth system) communication service.
  • the MTC terminal has low mobility.
  • the time for data transmission between the MTC terminal and the network side is controllable; that is, the MTC terminal can only access within a specified time period of the network.
  • the data transmission performed by the MTC network and the network side has low real-time requirements for data transmission and is time-tolerant.
  • the MTC terminal is energy limited and requires very low power consumption.
  • the MTC terminal can be managed in units of groups.
  • An actual MTC terminal can have one or more of the above characteristics.
  • the downlink control area of the LTE (Long Term Evolution) system may occupy the first 1-4 symbols of each downlink subframe under different load conditions. As shown in Figure 1, it is the control area of the LTE system in the prior art. Schematic diagram of the distribution with the data area.
  • the size of the downlink control area is notified by the PCFICH (Physical Control Format Indicator Channel), and the PCFICH channel is modulated and encoded to occupy 4 REGs (Resource Element Groups), and 4 REGs are on the entire downlink bandwidth.
  • Equalized distribution; PHICH (Physical HARQ Indicator Channel, HARQ, Hybrid Automatic Repeat Request) channel is used to carry response information for UL-SCH (Uplink Shared Channel) packets. , including ACK (Acknowledgement, acknowledgment) / NACK (Negative Acknowledgement), the PHICH channel is also distributed as evenly as possible over the entire frequency band (except for the resources occupied by the PCFICH).
  • the PDCCH (Physical Downlink Control Channel) channel is used for downlink downlink control information (DCI), including scheduling information and uplink power control information for downlink and uplink data transmission.
  • DCI downlink downlink control information
  • the PDCCH resource mapping is based on the control channel element CCE (Control Channel Element).
  • the PDCCH can occupy 1/2/4/8 CCEs according to different loads and channel conditions. After all PDCCHs are multiplexed, the entire PDCCH is multiplexed.
  • the control region performs interleaving and resource mapping on the remaining resources of the PCFICH and the PHICH. As can be seen from the above, the resource mapping of several major downlink control channels of LTE is closely related to the operating bandwidth of the system.
  • the system bandwidth defined in the existing protocol is as shown in Table 1.
  • the LTE standard requires that all UEs need to support 20M system bandwidth.
  • the embodiment of the invention provides a method and a device for transmitting downlink control information, which solves the problem that the LTE system cannot perform control signaling transmission for a small bandwidth terminal device in the prior art solution.
  • an embodiment of the present invention provides a method for transmitting downlink control information.
  • the network device is in a region other than the control region of the current system among the working bandwidths supported by the terminal device. Sending downlink control information to the terminal device.
  • the embodiment of the present invention further provides a network side device, including at least: a sending module, configured to: when a working bandwidth supported by the terminal device is smaller than a system bandwidth of a current system corresponding to the network side device, And transmitting downlink control information to the terminal device in a region other than the control region of the current system among the working bandwidths supported by the terminal device.
  • a sending module configured to: when a working bandwidth supported by the terminal device is smaller than a system bandwidth of a current system corresponding to the network side device, And transmitting downlink control information to the terminal device in a region other than the control region of the current system among the working bandwidths supported by the terminal device.
  • the embodiment of the present invention further provides a method for transmitting downlink control information: when the working bandwidth supported by the terminal device is smaller than the system bandwidth of the current system corresponding to the network device, the terminal device supports the The other areas of the working bandwidth except the control area of the current system receive the downlink control information sent by the network side device.
  • the embodiment of the present invention further provides a terminal device, including at least:
  • a receiving module configured to: in a working bandwidth supported by the terminal device, other than a control region of a current system, in a working bandwidth supported by the terminal device, where a working bandwidth supported by the terminal device is smaller than a system bandwidth of a current system corresponding to the network device
  • the other area receives the downlink control information sent by the network side device.
  • the technical solution proposed by the embodiment of the present invention has the following advantages: by applying the technical solution of the embodiment of the present invention, other areas than the control area of the current system among the working bandwidths supported by the terminal device That is, the data domain of the current system sends downlink control information to the terminal device, so that not only the terminal device supporting the small bandwidth can work normally in the system with various bandwidth configurations, but also does not need other existing systems in the system.
  • the terminal device is modified to ensure good compatibility of the network.
  • Such a technical solution makes it possible to support a small bandwidth terminal device to work normally in the existing system, and the terminal device is reduced without affecting the normal operation of the terminal device.
  • the working bandwidth saves the cost of the terminal equipment.
  • FIG. 1 is a schematic diagram of a distribution of a control region and a data region of an LTE system in the prior art
  • FIG. 2 is a schematic diagram of resource distribution in a control region TDM mapping scheme according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of resource fragmentation caused by a control region TDM scheme according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of resource distribution in a control region FDM mapping scheme according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of resource fragment distribution of a control region FDM scheme according to an embodiment of the present invention. detailed description
  • MTC device MTC terminal
  • M2M communication features such as low mobility, small amount of transmitted data, insensitivity to communication delay, and extremely low power consumption.
  • MTC devices in small-bandwidth system communication will be very large in the future, and in most cases, MTC devices have relatively simple functions and do not require very high transmission rates. Therefore, it is necessary to further reduce the cost of MTC devices.
  • Bandwidth is an important factor affecting the cost of MTC equipment. If the working bandwidth of MTC equipment can be appropriately reduced, the cost will be significantly reduced. At present, the LTE system requires that all terminals must support 20MHz system bandwidth. Otherwise, the terminal may not be able to read the control information when it works in a bandwidth larger than its own, resulting in its failure to work properly.
  • the embodiment of the present invention provides a method for transmitting downlink control information, which can solve the problem of how control signaling for a small bandwidth terminal is transmitted in an LTE system, thereby reducing the working bandwidth of the terminal. may. It should be noted that the scope of application of the technical solution proposed by the embodiments of the present invention is not limited to
  • the MTC terminal all of the small bandwidth systems and devices having the corresponding features in the embodiments of the present invention are all within the scope of the present invention.
  • the method for transmitting downlink control information specifically includes: when the working bandwidth supported by the terminal device is not less than the system bandwidth of the current system corresponding to the network side device, the network side device follows the existing technology. The scheme is processed, and the description will not be repeated here.
  • the network device When the working bandwidth supported by the terminal device is smaller than the system bandwidth of the current system corresponding to the network device, the network device is in the other working area than the control region of the current system in the working bandwidth supported by the terminal device.
  • the device sends downlink control information.
  • the network side device uses the time division multiplexing (Time Division Multiplex, the resource occupied by the downlink control information and the schedulable resource of the downlink control information in the working bandwidth supported by the terminal device.
  • TDM Time Division Multiplex
  • FDM Frequency Division Multiplex
  • the resources occupied by the downlink control information and the schedulable resources of the downlink control information are distributed in a time division multiplexing manner.
  • the network side device uses the resources occupied by the downlink control information and the downlink control information.
  • the resources occupied by the downlink control information are specifically:
  • ⁇ is specifically the number of maximum time-domain symbols occupied by the PDCCH in one subframe of the current system, or high-level signaling
  • ⁇ is specifically the number of maximum time-domain symbols occupied by the PDCCH in one subframe of the current system, or high-level signaling
  • the determining manner of the number of time domain symbols occupied by the downlink control information includes the following types.
  • the network side device notifies the number of time domain symbols occupied by the downlink control information of the terminal device through physical signaling.
  • the physical signaling notification manner includes, but is not limited to, a manner in which the control region indicates that the channel is to be ruled.
  • the control region indication channel may be implemented by using repeated coding and Reed Muller coding, and its bit meaning and coding.
  • the mode, the interleaving mode, and the time-frequency location of the occupied resources (including the resource mapping pattern) may be agreed in advance by the network measuring device and the terminal device.
  • Determination method 2 The number of fixed time domain symbols used by the network side device and the terminal device is used as the number of time domain symbols occupied by the downlink control information.
  • Determining mode 3 The number of time domain symbols occupied by the network side device and the terminal device by semi-static configuration of the downlink control information through the high layer signaling.
  • the specific determination mode may be determined according to actual scenario requirements, and the content change of the specific application determining manner does not affect the protection scope of the present invention.
  • the resources occupied by the downlink control information and the schedulable resources of the downlink control information are distributed by frequency division multiplexing.
  • the network side device transmits the resources occupied by the downlink control information and the schedulable resources of the downlink control information through different frequencies.
  • the resources occupied by the downlink control information are specifically:
  • N, SM
  • S is the number of time domain symbols in a subframe.
  • the manner of determining the size of the frequency band occupied by the downlink control information includes the following types.
  • the network side device notifies the frequency band and the frequency band position occupied by the downlink control information of the terminal device through physical signaling.
  • the physical signaling notification manner includes, but is not limited to, a manner in which the control region indicates that the channel is to be ruled.
  • the control region indication channel may be implemented by using repeated coding and Reed Muller coding, and its bit meaning and coding.
  • the mode, the interleaving mode, and the time-frequency location of the occupied resources (including the resource mapping pattern) may be agreed in advance by the network measuring device and the terminal device.
  • the determining manner is specifically implemented by the network side device notifying the terminal device of the frequency band size and the frequency band position occupied by the downlink control information by using a control area indication channel.
  • the control area indicates the number of resources occupied by the channel and the location of the resource mapping, which are specifically:
  • the network side device and the terminal device pre-agreed; or
  • the network side device notifies the terminal device by high layer signaling.
  • Determination mode 2 The network side device and the terminal device adopt a fixed frequency band size as the frequency band size and frequency band position occupied by the downlink control information.
  • Determination mode 3 The network side device and the terminal device semi-statically configure the frequency band size and frequency band position occupied by the downlink control information through high layer signaling.
  • the specific determination mode may be determined according to actual scenario requirements, and the content change of the specific application determining manner does not affect the protection scope of the present invention.
  • the resource granularity of the frequency band occupied by the downlink control information includes the following cases:
  • the amount of resources corresponding to one subcarrier or, The amount of resources corresponding to multiple subcarriers; or,
  • the amount of resources corresponding to a PRB Physical Resource Block
  • the amount of resources corresponding to multiple PRBs or,
  • the specific resource granularity may be determined in advance, or may be through information interaction.
  • the specific manner may be determined according to actual needs, and such changes do not affect the protection scope of the present invention.
  • the foregoing data resource area for performing service transmission (that is, the foregoing downlink control information schedulable resource for transmitting data information) is used to notify the terminal device by using the foregoing downlink control information, the data resource.
  • the size of the area may vary with the load demand, but the sum of the resource area corresponding to the downlink control information and the occupied frequency band resource of the data resource area may not exceed the available working bandwidth of the terminal equipment supporting the downlink control information transmission method.
  • the specific determination manner of the other areas except the control area of the current system in the working bandwidth supported by the terminal device is specific.
  • the implementation scenarios can include the following:
  • the network side device and the terminal device pre-agreed; or,
  • the network side device notifies the terminal device by broadcasting;
  • the network side device notifies the terminal device in advance through other messages.
  • the specific determination mode may be determined according to actual scenario requirements, and the content change of the specific application determining manner does not affect the protection scope of the present invention.
  • the embodiment of the present invention further proposes a scheme for data transmission using resource fragments, which is specifically described as follows.
  • the network side device sends the data information to the terminal device in the time-frequency domain physical resource fragment in the working bandwidth supported by the terminal device, and notifies the terminal device to pass the time-frequency domain physics through the downlink control information.
  • the resource fragment receives the data information.
  • the specific notification manner of the physical resource fragment in the time-frequency domain is: the network-side device notifies the size of the control region of the current system of the terminal device or the time-domain symbol remaining before the M+1 time-domain symbol in the current time slot by using the downlink control information. The number.
  • the M is the maximum number of time domain symbols occupied by the PDCCH in one subframe of the current system, or the number of time domain symbols occupied by the PDCCH in one subframe notified by the high layer signaling.
  • the scheme of data transmission through time-frequency domain physical resource fragments makes full use of bandwidth resources on the one hand, and increases the optional resources of data information transmission on the other hand, and realizes transmission efficiency! 3 ⁇ 4.
  • corresponding downlink control information needs to be received, and according to the scheduling of the corresponding downlink control information, the data information is received on the corresponding resource.
  • the specific transmission mode of the downlink control information may include time division multiplexing and frequency division multiplexing.
  • the specific transmission mode refer to the foregoing description.
  • the corresponding information negotiation and agreement mode is similar to the foregoing network side processing solution. This is not repeated.
  • the technical solution proposed by the embodiment of the present invention has the following advantages: by applying the technical solution of the embodiment of the present invention, other areas than the control area of the current system among the working bandwidths supported by the terminal device That is, the data domain of the current system sends downlink control information to the terminal device, so that not only the terminal device supporting the small bandwidth can work normally in the system with various bandwidth configurations, but also does not need other existing systems in the system.
  • the terminal device is modified to ensure good compatibility of the network.
  • Such a technical solution makes it possible to support a small bandwidth terminal device to work normally in the existing system, and the terminal device is reduced without affecting the normal operation of the terminal device.
  • the working bandwidth saves the cost of the terminal equipment.
  • the embodiment of the present invention supports MTC terminals with small bandwidth in the following description.
  • An application scenario in the LTE system is taken as an example, and a specific technical solution for transmitting a downlink control information in a system of a small bandwidth terminal is described.
  • a terminal device supporting a small bandwidth separately opens an area for the data area outside the system control area within the bandwidth range for placing the terminal supporting the small bandwidth.
  • the downlink control channel dedicated to the device dedicated to the device.
  • the multiplexing mode of the control area and the data area of the small bandwidth system it is divided into two types: time division multiplexing mode and frequency division multiplexing mode.
  • the time division multiplexing mode means that the control area of the small bandwidth system and the data area of the small bandwidth system respectively occupy different time domain symbols; the frequency division multiplexing mode refers to the control area of the small bandwidth system and the data area of the small bandwidth system respectively. Occupy different frequencies.
  • the control information of the corresponding small bandwidth system is placed in the control area of the small bandwidth system, and the control area of the LTE system and the possible PBCH (Physical Broadcast Channel) and PSS (Primary Synchronizing Signal) are included in the small bandwidth working bandwidth. Other areas than the common channel such as signal) and SSS (Secondary Synchronizing Signal) can be used for service scheduling of small bandwidth systems.
  • PBCH Physical Broadcast Channel
  • PSS Primary Synchronizing Signal
  • the TDM scheme refers to the control area and the data area used for small-bandwidth transmission occupying other resources except the traditional LTE system control area (including PBCH channel, PSS, SSS channel) in a time division multiplexing manner within the working bandwidth of the small bandwidth system. .
  • M is related to the LTE network configuration or subframe, the same below
  • the time domain symbol (N is notified by the control format of the small bandwidth system, the channel PCFICH is notified, the resource mapping position of the PCFICH in the small bandwidth system control area is fixed, and the network side and the terminal device have agreed, see the subsequent description for details) as its control area.
  • the control area of the small bandwidth terminal carries its downlink control channel, for example, including PCFICH, PHICH, and PDCCH.
  • control channels are distributed within the bandwidth supported by the small bandwidth system (for example, 5 MHz), and the coding, modulation, and physical resource mapping of the channel may be performed. Referring to the existing mechanism, some suitable modifications may be made as needed. As shown in FIG. 2, it is a schematic diagram of resource distribution under the control region TDM mapping scheme proposed by the embodiment of the present invention.
  • the eNB may dynamically determine whether each downlink subframe includes an area of a small bandwidth system according to a scheduling situation.
  • the PCFICH is used to indicate the number of symbols occupied by the control area of the small bandwidth system, and the same coding modulation mode and resource mapping mechanism of the existing mechanism can be adopted.
  • the number of symbols occupied by the control area is further increased, and correspondingly, it should also be increased.
  • the number of bits of the PCFICH and the number of resources occupied by its channel, the specific value evaluation is determined and pre-agreed.
  • the method in which the control area occupies a fixed-size resource may also be adopted.
  • the PCFICH channel is not required to notify the size of the control area; the number of time-domain symbols occupied by the control area may be agreed by the network side and the small-bandwidth terminal in advance. In this manner, the network side may also use high-level signaling to notify the small bandwidth terminal.
  • the PHICH is mapped on the unused bandwidth of the PCFICH in the small bandwidth system control region.
  • the PHICH uses three REGs, which differ from each other by about 1/3 of the bandwidth system bandwidth in the frequency domain.
  • the symbol distribution in the time domain mapping and the number of PHICHs in one subframe are notified by the system, such as MIB (Master Information Block). ).
  • the PDCCH is interleaved in the remaining resources other than the PCFICH and the PHICH in the downlink small bandwidth system control region.
  • the network side can perform data scheduling on the small bandwidth terminals in these areas, and notify the small bandwidth terminal LTE system of the control area to occupy the number of time domain symbols through the PDCCH channel (for example, indicated by 2 bits) Or, by using the PDCCH channel to notify the small bandwidth terminal, there are several remaining time domain symbols before the small bandwidth system control region in the time slot. According to this information, the small bandwidth terminal can determine whether there is any symbol before the control region to transmit the PDSCH. Thus, the waste of resources can be reduced.
  • the FDM scheme refers to the control area and the data area used for small-bandwidth transmission occupying resources other than the traditional system control area (including the PBCH channel, PSS, SSS channel) in a frequency division multiplexing manner within the bandwidth of the small bandwidth system.
  • the control region of the bandwidth terminal carries its downlink control channel, including PCFICH, PHICH, and PDCCH. These control channels are distributed within the bandwidth supported by the small bandwidth system (for example, 5 MHz).
  • the coding, modulation, and physical resource mapping of the channel can refer to the existing system.
  • FIG. 4 is a schematic diagram of resource distribution in a control region FDM mapping scheme according to an embodiment of the present invention.
  • control area of the small bandwidth system can occupy one side of the high frequency band in the terminal bandwidth or the side of the low frequency band.
  • the side occupying the high frequency band is taken as an example.
  • the downlink control channel for the small-bandwidth system transmission also includes common signaling such as PCFICH, PHICH, PDCCH, and SIB (System Information Block), PCH (Paging Channel), and the following.
  • the PCFICH is used to indicate the size of the control area of the small bandwidth system.
  • the minimum size of the control area may be the number of subcarriers, the number of PRBs, and the number of N times PRB areas.
  • the size of the control area is determined by the load of the system. If there are many system users, the control area will be larger, and vice versa. It can be identified by n bits. For example, 2 bits can identify 4 sizes, and 3 bits can identify 8 types of control. The size of the area.
  • the n-bits may be redundantly coded by means of repeated coding, Reed Muller coding, etc.
  • a conservative estimation method may be used, for example, foreseeing that the system may have K
  • the PHICH resource group, the L PDCCH channels can calculate the number of resources (such as the number of PRBs) that the resource may occupy as the resource lower limit PRB_MIN of the control region; another angle, similar to the distribution of the existing LTE system PCFICH, in order to ensure the PCFICH Performance needs to be distributed over a certain bandwidth to get enough frequency points Set gain, PRB_MIN can be determined by simulation.
  • the resource mapping of the PCFICH can fully consider the use of frequency uniform distribution, time domain distribution, and time-frequency domain interleaving distribution in the PRB_MIN resource range to improve its performance.
  • the PCFICH resource unit can be smaller. For example, it is no longer in REG, but directly in RE.
  • the specific coding rate and resource mapping mode can be determined by simulation evaluation.
  • the number of resources occupied by the PCFICH and the location of the resource mapping (or the mapping pattern) may be pre-agreed by the terminal and the network side, and may be a high-level signaling notification terminal, and the specific method does not It affects the scope of protection of the present invention.
  • control area can also be used to occupy a fixed-size resource.
  • the PCFICH channel is not required to notify the size of the control area.
  • the size of the frequency band occupied by the control area can be pre-defined by the network side and the small bandwidth terminal. The terminal can also be notified by the network using high layer signaling.
  • the PHICH channel is used to carry acknowledgement (ACK/NACK) information for small bandwidth system uplink shared channel (UL-SCH) packets.
  • ACK/NACK acknowledgement
  • UL-SCH small bandwidth system uplink shared channel
  • the PHICH can adopt a spread spectrum method similar to the existing LTE.
  • the interleaving distribution of the resources excluding the resources occupied by the PCFICH
  • the specific spreading mode and resource mapping mode are determined by simulation evaluation.
  • the distribution mode can be agreed between the network and the UE.
  • the number of PHICH resource groups can be notified by the system, such as MIB.
  • the PDCCH channel is used to carry DCI (downlink control information) for small-bandwidth system transmission, including scheduling information and uplink power control information for downlink and uplink data transmission.
  • DCI downlink control information
  • the design of the small bandwidth system PDCCH includes the resource size, coding, and interleaving methods, which can follow the existing PDCCH.
  • the resource mapping removes the PCFICH, the PHICH, and some other possible common channels (PBCH, PSS, SSS) on the resources indicated by the PCFICH. Resource mapping on the resource.
  • the small bandwidth terminal can share the public information such as the PCH information and the SIB information with the existing LTE terminal, and the information location needs the LTE system and the small bandwidth system respectively to separately notify the notification, and the existing UE passes the control area in the existing LTE system.
  • the small bandwidth system UE needs PDCCH scheduling in the small bandwidth system control region.
  • resource fragments can be used for data service transmission, as shown in Figure 5.
  • the base station is fully aware of the situation of the resource fragmentation.
  • the base station can inform the size (2 bits) of the LTE control region through the PDCCH channel, and then distribute the PDSCH channel of the small bandwidth system in the resource fragment, and inform the UE of the PDSCH through the PRB range.
  • the distribution situation because the UE can also know the distribution of each channel in the control area of the small bandwidth system, the PDSCH can be directly removed when detecting the PDSCH, and the PDSCH is detected in the remaining area.
  • the small bandwidth system other than the Max ⁇ PRB_MIN, small bandwidth system control area ⁇ is used for the PRB data resource area of the PDSCH transmission, and the PDCCH also needs to inform the UE of the size of the LTE control area (2 bits), so that the terminal understands The symbol position at the beginning of the data region on each subcarrier of its data region, to avoid fragmentation, and to interpret the consistency of the common channel with the existing LTE UE when sharing the common information channel with the existing system.
  • the physical resources of the PDSCH can be consistent with existing systems.
  • PDSCH It is used for downlink data service transmission, and may also be used for transmitting PCH information, SIB information, random access downlink information, and the like.
  • the existing LTE terminal and the small bandwidth system terminal can share the transmission PCH information, the SIB information, and the random access downlink information, and the common information, for the existing LTE terminal, adopts the LTE control.
  • PDCCH scheduling of the area For small bandwidth terminals, PDCCH scheduling of the small bandwidth system control area is adopted.
  • the technical solution proposed by the embodiment of the present invention has the following advantages: by applying the technical solution of the embodiment of the present invention, other areas than the control area of the current system among the working bandwidths supported by the terminal device That is, the data domain of the current system sends downlink control information to the terminal device, so that not only the terminal device supporting the small bandwidth can work normally in the system with various bandwidth configurations, but also does not need other existing systems in the system.
  • the terminal device is modified to ensure good compatibility of the network.
  • Such a technical solution makes it possible to support a small bandwidth terminal device to work normally in the existing system, and the terminal device is reduced without affecting the normal operation of the terminal device.
  • the working bandwidth saves the cost of the terminal equipment.
  • the embodiment of the present invention further provides a network side device, including at least:
  • a sending module configured to: in a working bandwidth supported by the terminal device, other than a control region of the current system, in a working bandwidth supported by the terminal device, where the working bandwidth supported by the terminal device is smaller than a system bandwidth of the current system corresponding to the network device Sending downlink control information to the terminal device.
  • the sending module is further configured to: when the downlink control information is sent to the terminal device, the resource occupied by the downlink control information and the schedulable resource of the downlink control information in the working bandwidth supported by the terminal device , distributed by time division multiplexing or frequency division multiplexing.
  • the sending module is specifically configured to determine the number of the time domain symbols occupied by the downlink control information, and the network control device notifies the terminal by physical signaling.
  • Time domain symbol occupied by device downlink control information Number of; or,
  • the network side device and the terminal device use the number of fixed time domain symbols as the number of time domain symbols occupied by the downlink control information; or
  • the network side device and the terminal device semi-statically configure the number of time domain symbols occupied by the downlink control information by using the high layer signaling.
  • the sending module is specifically configured to separately transmit the resources occupied by the downlink control information and the schedulable resources of the downlink control information by using different frequencies;
  • the method for determining the size of the frequency band occupied by the downlink control information includes: the network side device notifying the frequency band size and the frequency band position occupied by the downlink control information of the terminal device by using physical signaling; or
  • the network side device and the terminal device adopt a fixed frequency band size as a frequency band size and a frequency band position occupied by the downlink control information; or
  • the network side device and the terminal device semi-statically configure the frequency band size and the frequency band position occupied by the downlink control information through the high layer signaling.
  • the network side device and the terminal device pre-agreed; or,
  • the network side device notifies the terminal device by broadcasting;
  • the network side device notifies the terminal device in advance through other messages.
  • the sending module is further configured to send the data information to the terminal device in the time-frequency domain physical resource fragment in the working bandwidth supported by the terminal device, and notify the terminal device to receive the data information by using the time-frequency domain physical resource fragment by using the downlink control information.
  • the sending module is specifically configured to notify the terminal by using the downlink control information to notify the terminal device of the size of the control region of the current system or the number of time domain symbols remaining before the M+1 time domain symbol in the current time slot.
  • the M is specifically the number of the maximum time domain symbols occupied by the PDCCH in one subframe of the current system, or the number of time domain symbols occupied by the PDCCH in one subframe notified by the high layer signaling.
  • the embodiment of the present invention further provides a terminal device, where the terminal device includes at least a receiving module, where the working bandwidth supported by the terminal device is smaller than the system bandwidth of the current system corresponding to the network device, in the terminal device.
  • the other areas of the supported working bandwidth except the control area of the current system receive the downlink control information sent by the network side device.
  • the receiving module is specifically configured to:
  • the resources occupied by the downlink control information distributed by the network side device and distributed by the time division multiplexing or the frequency division multiplexing are used to adjust the resources and the downlink control information.
  • the receiving module is specifically configured to: receive, by the terminal device, the resources occupied by the downlink control information transmitted by the network side device and the downlink control information schedulable resources, in the working bandwidth supported by the terminal device, ;
  • the determining the number of the time domain symbols occupied by the downlink control information includes: receiving, by the terminal device, the number of time domain symbols occupied by the downlink control information sent by the network side device by using physical signaling; or
  • the number of fixed time domain symbols used by the terminal device and the network side device is used as the number of time domain symbols occupied by the downlink control information;
  • the terminal device and the network side device semi-statically configure the number of time domain symbols occupied by the downlink control information through the high layer signaling.
  • the receiving module is specifically configured to receive, by the network device, the resources occupied by the downlink control information transmitted by the network side device and the resources schedulable by the downlink control information, in the working bandwidth supported by the terminal device;
  • the determining manner of the frequency band occupied by the downlink control information includes: receiving, by the terminal device, the frequency occupied by the downlink control information sent by the network side device by using physical signaling Band size and band position; or,
  • the terminal device and the network side device adopt a fixed frequency band size as a frequency band size and a frequency band position occupied by the downlink control information; or
  • the terminal device and the network side device semi-statically configure the frequency band size and the frequency band position occupied by the downlink control information through the high layer signaling.
  • the terminal device and the network side device pre-agreed; or,
  • the terminal device determines by receiving a broadcast sent by the network side device.
  • the terminal device is predetermined by receiving other messages sent by the network side device.
  • the receiving module is further configured to: determine, by using the downlink control information sent by the network side device, the time-frequency domain physical resource fragment in the working bandwidth supported by the terminal device, and receive the network-side device by using the time-frequency domain physical resource fragment.
  • Data letter 3 ⁇ 4.
  • the receiving module is specifically configured to receive, by receiving the downlink control information sent by the network side device, a size of a control region of the current system or a time domain symbol remaining before the M+1 time domain symbol in the current time slot. Number, which determines the time-frequency domain physical resource fragment in the working bandwidth supported by the terminal device.
  • the technical solution proposed by the embodiment of the present invention has the following advantages: by applying the technical solution of the embodiment of the present invention, other areas than the control area of the current system among the working bandwidths supported by the terminal device That is, the data domain of the current system sends downlink control information to the terminal device, so that not only the terminal device supporting the small bandwidth can work normally in the system with various bandwidth configurations, but also does not need other existing systems in the system.
  • the terminal device is modified to ensure good compatibility of the network.
  • Such a technical solution makes it possible to support a small bandwidth terminal device to work normally in the existing system, and the terminal device is reduced without affecting the normal operation of the terminal device.
  • the working bandwidth saves the cost of the terminal equipment.
  • the embodiments of the present invention may be implemented by hardware, or may be implemented by means of software plus a necessary general hardware platform.
  • the technical solution of the embodiment of the present invention may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (which may be a CD-ROM, a USB flash drive, a mobile hard disk, etc.).
  • a number of instructions are included to cause a computer device (which may be a personal computer, a server, or a network side device, etc.) to perform the methods described in various implementation scenarios of embodiments of the present invention.
  • modules in the apparatus in the implementation scenario may be distributed in the apparatus for implementing the scenario according to the implementation scenario description, or may be correspondingly changed in one or more devices different from the implementation scenario.
  • the modules of the above implementation scenarios may be combined into one module, or may be further split into multiple sub-modules.

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Abstract

L'invention porte sur un procédé et un dispositif de transmission d'informations de commande de liaison descendante. Au moyen de la solution technique selon les modes de réalisation de la présente invention, des informations de commande de liaison descendante sont envoyées à un dispositif terminal au niveau de régions, c'est-à-dire une région de données d'un système courant, autres qu'une région de commande du système courant dans une largeur de bande de fonctionnement prise en charge par le dispositif terminal, de telle sorte qu'un dispositif terminal prenant en charge une petite largeur de bande peut fonctionner normalement dans des systèmes ayant diverses configurations de largeur de bande, et d'autres dispositifs terminaux existant dans le système n'ont pas besoin d'être modifiés, ce qui assure la compatibilité souhaitable du réseau. Au moyen de la solution technique, il devient possible que le dispositif terminal prenant en charge la petite largeur de bande fonctionne normalement dans le système existant, et dans la situation de ne pas influer sur le fonctionnement normal du dispositif terminal, la largeur de bande de fonctionnement du dispositif terminal est réduite, ce qui réduit le coût du dispositif terminal.
PCT/CN2012/081841 2011-09-30 2012-09-24 Procédé et dispositif de transmission d'informations de commande de liaison descendante WO2013044771A1 (fr)

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