CN112118612A - Method for detecting and accessing multi-mode user terminal signal - Google Patents
Method for detecting and accessing multi-mode user terminal signal Download PDFInfo
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- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/10—Access restriction or access information delivery, e.g. discovery data delivery using broadcasted information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/20—Selecting an access point
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses a method for detecting and accessing signals of a multimode user terminal. The problem that a user terminal cannot receive service when a frequency band cell meeting S criteria resides on an unlicensed frequency band in the prior art is solved; the invention comprises the following steps: s1: a user terminal receives cell broadcast synchronization signals of signal transmitting equipment through a plurality of frequency bands to acquire cell identification information of the signal transmitting equipment; s2: the user terminal receives the signal holding time and the signal time threshold according to the cell identification information of the signal transmitting equipment; s3: the user terminal determines whether the signal transmitting equipment can be accessed to and reside in the cell of the signal transmitting equipment according to the signal holding time length and the signal time length threshold value; the cell access criteria of the signal transmitting device include at least: signal hold duration > signal duration threshold. The method solves the problem that the user terminal can not reside, access and receive service when residing the authorized/unauthorized frequency band cell which meets the S criterion and is used.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a signal detection and access method for a multimode user terminal.
Background
With the rapid development of society, the requirements of various applications in five links of power generation, power transmission, power transformation, power distribution and power utilization of a power network on the coverage range, the electric energy quantity and the electric energy quality of power supply and monitoring are exponentially increased, and the performance of the traditional power network cannot gradually follow the increasing power demand. Based on this, a new generation of "Smart Grid" (SG) is produced.
In the prior art, a scheme for selecting an authorized frequency band for a resident cell generally occurs after a Public Land Mobile Network (PLMN) is selected, so that a cell with a channel quality meeting a condition can be selected as soon as possible to reside after a User Equipment (UE) is turned on. Currently, in 3GPP, an S criterion is adopted for a user equipment in LTE/LTE-a systems to perform cell selection. However, in the unlicensed frequency band, the used frequency band is discontinuous in time, and the access time length allowed each time is limited, so there are many problems when the frequency band used by the unlicensed frequency band system using the S criterion is used, for example, the time length of each time the frequency band is used by the unlicensed frequency band signal transmitting device is limited, the cell reference signal quality measured by the UE meets the S criterion at a certain moment, and when the UE is ready to select the cell for camping, the use of the frequency band channel used by the signal transmitting device is finished, so that the frequency band cell of the selected signal transmitting device cannot continue to provide service for the UE.
For example, a method for optimizing the network selection process of the multimode and multiband user terminal disclosed in chinese patent literature has a publication number CN110913459A, and the method includes: the NAS of the UE selects a PLMN with the highest priority according to a network selection principle, and selects a high-priority mode in the PLMN; sending a network selection request signal to the access layer of the mode; after receiving the network selection request, executing the sub-band cell selection; if the cell meeting the residence condition is not found in the mode; initiating a network selection process for the access layer of the next mode, wherein the network selection methods are the same; all access layers do not find suitable cells; then the next PLMN network selection is carried out, and the network selection process is the same; if all PLMNs do not find a suitable cell to reside, the UE tries to perform limited residence; and if the cell meeting the resident condition is found, indicating that the network selection is successful.
Disclosure of Invention
The invention mainly solves the problem that the user terminal UE can not receive service when the frequency band cell meeting the S criterion resides on the unlicensed frequency band in the prior art; a method for detecting and accessing signals of a multi-mode user terminal is provided, so that the user terminal can receive service when a frequency band cell meeting S criteria resides on an unlicensed frequency band.
The technical problem of the invention is mainly solved by the following technical scheme:
the invention comprises the following steps:
s1: a user terminal receives cell broadcast synchronization signals of signal transmitting equipment through a plurality of frequency bands to acquire cell identification information of the signal transmitting equipment;
s2: the user terminal receives the signal holding time length T according to the cell identification information of the signal transmitting equipmentkeepSum signal duration threshold Tthreshold；
S3: the user terminal keeps the duration T according to the signalkeepSum signal duration threshold TthresholdAnd determining whether the signal transmitting equipment can access and reside in the cell of the signal transmitting equipment.
The user terminal receives the synchronous signal broadcasted by the cell of the signal transmitting equipment through the used frequency band to obtain the cell identification of the signal transmitting equipment, and then receives the signal holding time length T according to the cell identification of the signal transmitting equipmentkeepSum signal duration threshold TthresholdFinally, the duration T is kept according to the signalkeepSum signal duration threshold TthresholdAnd determining whether the cell of the signal transmitting equipment can be accessed, and residing in the cell of the signal transmitting equipment. Therefore, the problem that the user terminal cannot reside, access and receive service when the user terminal resides in the authorized/unauthorized frequency band cell which meets the S criterion and is used can be solved.
Preferably, the signal holding time period T iskeepOr signal duration threshold TthresholdThe MIB message of the main information block loaded in Beacon signals and broadcast messagesAt least one of a new establishment message, a system information block, SIB1 message, or a SIB2 message; wherein the first new message is sent before the SIB2 message.
Preferably, before the step S3, the method further includes:
the user terminal receives an indication message according to the cell identification information of the signal transmitting equipment, wherein the indication message is used for indicating whether the cell of the signal transmitting equipment supports the transmission delay sensitive service or not; and in case that the service supported by the ue is not a delay sensitive service, continuing to execute step S3. And judging whether the cell of the signal transmitting equipment supports the transmission delay sensitive service or not through the indication message.
Preferably, the indication message is carried in at least one of Beacon signal, MIB message or second new message.
Preferably, the MIB message includes an idle field and a system downlink bandwidth field; when the indication message is carried in the MIB message, the indication message is carried in an idle field in the MIB message; when the indication message is carried in the second new message, the second new message is sent before the SIB1 message.
Preferably, the indication message is determined by the channel duty ratio counted by the cell of the signal transmitting equipment and the time delay of the service supported and transmitted by the user terminal; the channel duty ratio refers to the ratio of the time length of the channel used by the signal transmitting equipment to the available time length of all channels in a preset time period; the value of the channel duty ratio on the authorized frequency band is defaulted to 1; the value is less than 1 in the unlicensed frequency band.
Preferably, when the signal transmitting equipment determines that the access time interval corresponding to the channel duty ratio does not exceed the time delay of the service supported by the user terminal for transmission, the indication message is determined to be used for indicating the signal transmitting equipment to support the transmission of the delay-sensitive service; otherwise, determining that the indication message is used for indicating that the signal transmitting equipment does not support the transmission delay sensitive service.
Preferably, the cell access criterion of the signal transmitting device at least comprises the following itemsA piece: signal hold duration Tkeep> signal duration threshold Tthreshold。
Preferably, the signal transmitting device is a base station of a cellular network operating in a licensed frequency band, or an access point AP in a WLAN network operating in 2.4GHz and 5GHz unlicensed frequency bands, or a device that transmits a beacon signal in a Zigbee, RFID, LoRa, IoT network operating in 230M, 470M, 700M, 1800MHz frequency bands.
The invention has the beneficial effects that:
according to signal hold duration TkeepSum signal duration threshold TthresholdWhether the signal transmitting equipment can be accessed is determined, and the cell of the signal transmitting equipment is resided, so that the problem that the user terminal cannot be resided, accessed and used for receiving service when the user terminal resides in the cell of the authorized/unauthorized frequency band which meets the S criterion is solved.
Drawings
Fig. 1 is a flow chart of a multimode user terminal signal detection and access method of the present invention.
Fig. 2 is a network framework diagram of multimode terminal signal detection according to the present invention.
Fig. 3 is a frame structure diagram of a MIB message of the present invention.
Fig. 4 is a block diagram of a multimode user terminal signal detection and access device according to the present invention.
In the figure, 101 is a detection unit, 102 is a first processing unit, 201 is a communication unit, 202 is a second processing unit.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Example (b):
a method for detecting and accessing a signal of a multi-mode user terminal according to this embodiment, as shown in fig. 1, includes the following steps:
s1: the user terminal receives the cell broadcast synchronization signal of the signal transmitting equipment through a plurality of frequency bands to acquire the cell identification information of the signal transmitting equipment.
As shown in fig. 2, the multimode terminal network framework may include a plurality of signal transmitting devices of different frequency bands and multimode user terminals. The number of the signal transmitting devices and the number of the user terminals may be one or more, and in the figure, the number is shown as 1 user terminal and a schematic diagram of a plurality of signal transmitting devices.
The range covered by a signal transmitting device is called a cell of the signal transmitting device, and the identity of a signal transmitting device can also be correspondingly expressed as the cell identity of the signal transmitting device covered by the signal transmitting device.
A signal transmitting device may support the used communication band or band channel, which may include both the used band (channel) and the licensed band (channel). The frequency bands used herein may include suitable frequency bands supported by wireless access technologies such as wireless fidelity (WiFi), bluetooth (B1 user terminal), Zigbee, and the like.
The signal transmitting equipment broadcasts a synchronization signal through the used frequency band, and the synchronization signal carries an identifier of the signal transmitting equipment, namely a cell identifier of the signal transmitting equipment covered by the signal transmitting equipment, which is hereinafter referred to as a cell identifier of the signal transmitting equipment. Accordingly, the user terminal receives the synchronization signal broadcasted by the cell of the signal transmitting device covered by the signal transmitting device through the used frequency band to obtain the cell identification of the signal transmitting device.
In this embodiment, the signal transmitting device can broadcast a synchronization signal in a cell of the signal transmitting device covered by the signal transmitting device in real time or periodically, where the synchronization signal carries a cell identifier of the signal transmitting device, that is, an identifier of the signal transmitting device. After the ue is powered on or disconnected from the Network, a Non-Access Stratum (NAS) of the ue can instruct a Radio Resource Control (RRC) layer to search for a Public Land Mobile Network (PLMN). The RRC Layer further instructs a Physical Layer (PHY) to perform initial cell search on a corresponding Physical Channel, such as a Broadcast Channel (BCH) and a Supplemental Channel (SCH). After searching the cell, the RRC layer may instruct the PHY layer to receive a synchronization signal broadcasted by the cell of the signal transmitting device, thereby completing cell synchronization.
The synchronization signal carries a cell identifier of the signal transmitting device. After receiving the synchronization signal, the user terminal can resolve a cell identifier of the signal transmitting device, such as a Cell ID (CI) of the signal transmitting device.
The number of the signal transmitting device or the cells of the signal transmitting device may be one or more, the number of the synchronization signals received by the corresponding user terminal may be one or more, the number of the PCIs may also refer to one or more, and this embodiment is not limited.
S2: the user terminal receives the signal holding time length T according to the cell identification information of the signal transmitting equipmentkeepSum signal duration threshold Tthreshold。
Signal hold duration TkeepOr signal duration threshold TthresholdAt least one of a master information block MIB message, a first new establishment message, a system information block SIB1 message or a SIB2 message carried in a Beacon signal, a broadcast message; wherein the first new message is sent before the SIB2 message.
The user terminal can send the MIB messages at a preset time slot (e.g., 40ms) after the signal transmitting device sends the synchronization signal, according to the fixed position relationship between the synchronization signal and the Master Information Block (MIB) message.
Accordingly, the RRC layer may instruct the PHY layer to receive MIB messages Broadcast by a cell of the signal transmitting apparatus (i.e., the signal transmitting apparatus) on a corresponding Physical Channel, such as a Physical Broadcast Channel (PBCH). The MIB message may be encapsulated/carried in a broadcast message, and at this time, the PHY layer may obtain the MIB message through message parsing after receiving the broadcast message. The PHY layer may pass MIB messages through a Media Access Control (MAC) layer to the RRC layer.
The MIB message may include an indication message used to indicate whether the cell of the signal transmitting apparatus supports the transmission delay sensitive service, that is, the indication message is carried in the MIB message and broadcasted by the signal transmitting apparatus (the cell of the signal transmitting apparatus) to the user terminal to inform whether the cell of the signal transmitting apparatus supports the transmission delay sensitive service.
For example, fig. 3 shows a frame structure diagram of a MIB message. As shown in fig. 3, the MIB message may include an idle field, a System Frame Number (SFN) field, a Physical hybrid automatic repeat Indicator Channel (PHICH) field, and a downlink bandwidth field. Wherein, the SFN field supports 8 bits with the highest occupation. The PHICH field is used to carry PHICH configuration information, and the diagram may occupy 3 bits. The downlink bandwidth field is used for carrying downlink system bandwidth information, and the figure can occupy 3 bits. The idle field can use 1bit to carry indication information for indicating whether the cell of the signal transmitting equipment supports the transmission delay sensitive service, and the idle field can occupy one or more bits, which is not limited in the embodiment of the present invention.
The indication message may be embodied in the form of "0/1", "Yes/No", and other indication functions, for example, "1" indicates that the cell of the signal transmitting apparatus supports the transmission delay sensitive service, and "0" indicates that the cell of the signal transmitting apparatus does not support the transmission delay sensitive service.
The signal transmitting device (cell of the signal transmitting device) may also broadcast a first new setup message, the first new setup message including the indication message. The first reconfiguration message may refer to a System Information Block (SIB) message newly created by the signaling device or other messages, such as a SIB0 message, which is not limited in the embodiment of the present invention. The first new message is sent before the SIB1 message is broadcast by the cell of the signal transmitting device.
Specifically, a Radio Resource Control (RRC) layer of the ue may instruct a Physical layer (PHY) layer of a bottom layer to receive a first new message broadcasted by a cell (i.e., a signal transmitting device) of the signal transmitting device on a corresponding Physical Channel, such as a Physical Broadcast Channel (PBCH). The first new message can be encapsulated/carried in the broadcast message, and at this time, the PHY layer can obtain the first new message through message parsing after receiving the broadcast message. The PHY layer may pass the first reestablishment message through a Media Access Control (MAC) layer to the RRC layer.
The indication information may be determined by the signal transmitting apparatus (i.e., the cell of the signal transmitting apparatus). Specifically, the signal transmitting device may count the channel duty ratio according to historical usage information of the used frequency band; then, the indication information is determined according to the duty ratio of the channel and the delay requirement of the service supported by the user terminal, namely, whether the signal transmitting equipment supports the transmission delay sensitive service is determined.
For example, in the system of the unlicensed frequency band signal transmitting device, the signal transmitting device may count the channel duty ratio of the unlicensed frequency band signal transmitting device within the used frequency band according to the historical access information of the used frequency band of the unlicensed frequency band signal transmitting device.
Suppose that the current signal transmitting equipment counts that the user terminal is within 1 hour, a frequency band channel which is used once needs to be preempted at an interval of 100ms after network disconnection every time, and then the access of the unlicensed frequency band signal transmitting equipment is carried out. Therefore, the signal transmitting equipment can determine the channel duty ratio of the user terminal for accessing the signal transmitting equipment in the unlicensed frequency band within 1 hour.
Then, the signal transmitting device can determine whether the signal transmitting device supports the transmission delay sensitive service according to the duty ratio of the access channel of the signal transmitting device in the unlicensed frequency band and the delay requirement of the service supported by the user terminal for transmission.
For example, suppose that the user terminal needs a service whose transmission delay does not exceed 10ms, however, the access time interval corresponding to the channel duty ratio counted by the signal transmitting device is 100ms, that is, the access of the signal transmitting device in the unlicensed frequency band is performed every 100ms on average. Since 100ms is greater than 10ms, the signal transmitting device may consider that the signal transmitting device cannot support transmission of a service that meets the delay requirement of the user terminal, and then may determine that the signal transmitting device does not support transmission of the delay sensitive service, that is, the indication information is used to indicate that the signal transmitting device does not support transmission of the delay sensitive service.
The channel duty ratio refers to a ratio of time for preempting the frequency band used in a preset time period. When the access time interval corresponding to the channel duty ratio does not exceed the time delay of the service supported by the user terminal for transmission, the signal transmitting equipment can determine that the signal transmitting equipment supports the transmission delay sensitive service, and the corresponding indication information can be represented by a '1' identifier. Otherwise, the signal transmitting equipment determines that the signal transmitting equipment does not support the transmission delay sensitive service, and the corresponding indication information can be represented by "0".
The user terminal can determine whether the user terminal receives the system message broadcasted by the signal transmitting equipment according to the received indication information and the requirement of the user terminal for supporting the transmitted service. The system messages herein may include, but are not limited to, any one or more of the following: SIB1 through SIB11 messages.
Specifically, if the indication information is used to indicate that the cell of the signal transmitting device supports transmission of the delay sensitive service, the user terminal may transmit the relevant service through the signal transmitting device regardless of whether the service supported by the user terminal for transmission is the delay sensitive service, and the user terminal may receive the system message broadcast by the signal transmitting device.
If the indication information is used to indicate that the cell of the signal transmitting device does not support the transmission delay sensitive service, the user terminal needs to determine whether to receive the system message broadcast by the signal transmitting device according to the service that the user terminal supports transmission. If the service supported by the user terminal is the delay sensitive service, the process is ended, and a used frequency band is reselected for cell search. If the service supported by the user terminal is not the delay sensitive service, that is, the user terminal does not transmit the delay sensitive service, the user terminal can receive the system message broadcast by the signal transmitting device.
The system message may be carried in a Downlink signaling broadcast by the signal transmitting device, where the Downlink signaling includes a Physical Downlink Control Channel (PDCCH) indication information. When the user terminal receives the Downlink signaling, the system message broadcasted by the signal transmitting device can be received in a corresponding Physical Downlink Shared Channel (PDSCH) according to the indication of the PDCCH indication information. Meanwhile, the ue may also receive other parameter messages broadcast by the signal transmitting device in a corresponding Physical Hybrid ARQ Indicator Channel (PHICH), which is not limited in the embodiment of the present invention.
The system message may include at least SIB1 message, and may further include any one or more messages of SIB2 full SIB11, which is not limited in the embodiments of the present invention.
The RRC layer of the user terminal may receive the system message broadcast by the signal transmitting apparatus. After the RRC layer of the user terminal receives the system message, the SIB1 message may be known through message parsing. Then, the RRC layer can know which SIB messages from SIB2 to SIB11 are broadcasted by the signal transmission device according to the scheduling information field in the SIB1 message, that is, the RRC layer can determine whether the system message broadcasted by the signal transmission device is completely received according to the scheduling information field in the SIB1 message, that is, whether the SIB1 to SIB11 messages are completely received. If yes, continuing the process; otherwise, the flow ends.
The user terminal can know part of cell selection parameters, namely receiving parameters, of the cell of the signal transmitting equipment through the received system message. For example, the system message may include, but is not limited to, the following reception parameters: qoffsettemp、Qrxlevmin、Qqualmin、PEMAX1、PEMAX2、Qrxlevminoffset、QqualminoffsetAnd the like.
Wherein Q isoffsettempWhich refers to the temporary offset, in dBm, of the cell signal in the cell of the signal transmitting device.
QrxlevminRefers to a Reference Signal Received Power (RSRP) value in dBm in a cell of a Signal transmitting device.
QqualminRefers to a Reference Signal Received Quality (RSRQ) value in decibels (dB) in a cell of a Signal transmitting apparatus.
PEMAX1And PEMAX2The maximum uplink transmission power allowed to be used by the user terminal in the cell of the signal transmitting equipment is indicated, and the unit is dBm.
QrxlevminoffsetRefers to a cell in which a user terminal estimates a signal transmitting apparatus using the signal strength of a cell reference signalFor signal strength of the region, Q is requiredrxlevminOffset is performed to prevent ping-pong effects.
QqualminoffsetWhen the user terminal adopts the signal quality of the cell reference signal to evaluate the signal quality of the cell of the signal transmitting equipment, Q is required to be correctedqualminThe offset is also used to prevent ping-pong effects.
The signal transmitting apparatus may also broadcast a signal hold time period TkeepSum signal duration threshold Tthreshold. Accordingly, the user terminal can receive the signal holding time length T broadcasted by the signal transmitting devicekeepSum signal duration threshold Tthreshold。
In particular, the signal hold duration TkeepAnd/or signal duration threshold TthresholdMay be carried in any one or more of the following messages: master information block MIB message, second new message, system information block SIB1 message, SIB2 message. I.e. the signal transmitting apparatus can hold the signal for a time period TkeepSum signal duration threshold TthresholdSimultaneously or separately carried in any one or more of the above messages to be broadcast to the user terminals.
When signal holds for a time period TkeepSum signal duration threshold TthresholdWhen broadcast in the second new message, the second new message needs to be sent before the SIB2 message, so that the ue can know the signal retention duration T in timekeepSum signal duration threshold Tthreshold。
It should be noted that, the first new message and the second new message may refer to the same message or different messages, and the present invention is not limited thereto. Further, T herekeepRefers to the signal strength S of the cell reference signalrxlevGreater than 0, and signal quality S of cell reference signalqualA holding period greater than 0, TthresholdMeans SrxlevAnd SqualPreset threshold values for holding durations, T, both greater than 0thresholdMay be configured on the side of the signal transmission apparatus.
S3: the user terminal keeps the duration T according to the signalkeepSum signal durationThreshold value TthresholdAnd determining whether the signal transmitting equipment can access and reside in the cell of the signal transmitting equipment.
The user terminal keeps the duration T according to the signalkeepSum signal duration threshold TthresholdAnd determining whether the cell of the signal transmitting apparatus meets a cell access criterion of the signal transmitting apparatus.
The cell access criterion of the signal transmitting equipment comprises the following conditions besides two conditions of the S criterion: t iskeep＞Tthreshold。
After receiving the system message, the user terminal can determine the cell selection parameter in the S criterion according to the capability level of the user terminal and the system message. The cell selection parameter includes a receiving parameter and a measurement parameter, where the receiving parameter may refer to a part of the cell selection parameter carried in the system message, and the measurement parameter may refer to a part of the cell selection parameter measured by the user terminal itself.
For example, the receiving parameters may include, but are not limited to, Q as described aboveoffsettemp、Qrxlevmin、Qqualmin、Qrxlevminoffset、QqualminoffsetAnd the like. For the received parameters, reference may be made to the related description in the foregoing embodiments, which is not repeated herein. The measurement parameters may include, but are not limited to, the following: qrxlevmeas、Qqualmeas、Pcompensation、PPowerClass。
Wherein Q isrxlevmeasIt means that the user terminal measures the RSRP value of the cell of the signal transmitting device.
QqualmmeasIt may refer to a user terminal measuring the RSRQ value of the cell of the signal transmitting device. Here Q isrxlevmeasAnd QqualmeasThe pilot signal may be a pilot signal sent by the signal transmitting device after scrambling by using PCI after broadcasting the synchronization signal.
PcompensationCan mean with PEMAX1And PEMAX2The relevant parameter number, in dB.
PPowerClassThe maximum uplink transmission power in dBm for supporting transmission is determined by the user terminal self-capability.
The user terminal can judge whether the cell of the signal transmitting equipment meets the S criterion according to the acquired receiving parameters and the acquired measuring parameters. Wherein the S criterion includes the following two conditions:
Srxlev> 0 and Squal＞0
Wherein S isrxlevAnd SqualRespectively as follows:
Srxlev＝Qrxlevmeas-(Qrxlevmin+Qrxlevminoffset)-Pcompensation-Qoffsettemp Squal＝Qqualmeas-(Qqualmin+Qqualminoffset)-Qoffsettemp
in the embodiment of the invention, the user terminal receives the broadcast message and the beacon signal of the signal transmitting equipment according to the supported mode to acquire the TkeepAnd Tthreshold. Thereafter, it is also determined whether the following condition is satisfied:
Tkeep＞Tthreshold
that is, the user terminal knows the receiving parameters, the measurement parameters and TkeepAnd Tthre5holdThereafter, it may be determined whether the cell of the signal transmitting apparatus satisfies the cell access criterion of the signal transmitting apparatus. Wherein the cell access criterion of the signal transmitting apparatus may include the following condition Srxlev＞0，Squal> 0 and Tkeep＞Tthreshold. The cell access criterion of the signal transmitting device includes two conditions of the S criterion, and also includes Tkeep＞TthresholdThe conditions of (1).
T mentioned abovekeepAnd TthresholdThe cell transmitting the signal according to the specific value can be adjusted in real time according to the actual channel duty ratio, the type of the service to be accessed, the service volume and the like, and the cell is updated after being adjusted every time by informing the user terminal in the broadcast message/beacon message.
What the above-mentioned user needs to do is timeFor delay sensitive service, a larger T needs to be setthresholdAt this time, most signal transmission apparatuses in the unlicensed band cannot satisfy this condition. The user is forced to camp on the signal transmitting device of the licensed frequency band.
When the user needs to perform the non-delay sensitive service, a smaller T needs to be setthresholdAt this time, most signal transmitting devices in the unlicensed frequency band satisfy the condition, and the user may randomly select one signal transmitting device to access and camp on, or select the best signal transmitting device to access and camp on according to a certain criterion, for example, according to a criterion that the frequency occupied by the signal transmitting device is from low to high, to receive the service.
The user terminal determines whether the cell of the signal transmitting device is resident under the condition that whether the cell of the signal transmitting device can be accessed or not.
In the embodiment of the present invention, when the south of the user employee determines that the cell of the signal transmitting apparatus satisfies all the conditions in the cell access criteria of the signal transmitting apparatus, the user terminal may camp in the cell of the signal transmitting apparatus to receive the service of the cell of the signal transmitting apparatus.
When the number of the signal transmitting equipment/the cells of the signal transmitting equipment is multiple, after the screening of the cell access criteria of the signal transmitting equipment, a plurality of cells of the signal transmitting equipment meeting the cell access criteria of the signal transmitting equipment exist, namely the signal transmitting equipment, and at the moment, the user terminal can randomly select one cell of the signal transmitting equipment from the cells of the plurality of signal transmitting equipment meeting the cell access criteria of the signal transmitting equipment for residing; alternatively, the user terminal may select one S from cells of a plurality of signal transmitting apparatuses satisfying the cell access criterion of the signal transmitting apparatusrelevOr SqualThe cell of the signal transmitting apparatus having the largest value is camped to receive the optimal service of the cell of the signal transmitting apparatus.
It should be noted that the method provided by the embodiment of the present invention is applicable to various communication systems, and is used for camping on a frequency band used by a signal transmitting device, which meets the cell access criterion, such as a WCDMA system, a system of an unlicensed frequency band signal transmitting device, and the like.
By implementing the embodiment of the invention, the problems that the user terminal cannot receive service when residing in the used frequency band cell meeting the S criterion, the user terminal cannot access the used frequency band channel for a long time and cannot detect the existence of the used frequency band cell meeting the S criterion, the resident authorized frequency band cell cannot achieve the effect of throttling and reducing the load of the authorized frequency band can be solved.
Based on the same inventive concept, please refer to fig. 4, which illustrates a schematic structural diagram of an embodiment of a signal transmitting device and a user terminal according to the present invention, and a system 40 for selecting a frequency band camping cell formed by the signal transmitting device and the user terminal. As shown in fig. 4, there may be a communication connection between the user terminal 100 and the signal transmitting device 200, such as a bluetooth, user terminal tooth or WiFi connection, which may enable data communication between the two. The description is developed below.
As shown in fig. 4, the user terminal includes: a detection unit 101 and a first processing unit 102. Wherein:
a detecting unit 101, configured to obtain a cell identifier of a signal transmitting device by intercepting a plurality of available frequency bands and receiving a synchronization signal broadcast by a cell of the signal transmitting device; the detecting unit 101 is further configured to receive the signal holding duration T according to the cell identifier of the signal transmitting apparatuskeepSum signal duration threshold Tthreshold。
A first processing unit 102 for keeping the time length T according to the signalkeepSum signal duration threshold TthresholdDetermining whether the cell of the signal transmitting equipment can be accessed, and camping on the cell of the signal transmitting equipment, wherein the cell access criterion of the signal transmitting equipment at least comprises the following conditions: t iskeep＞Tthreshold。
In an embodiment of the present invention, the detecting unit 101 is further configured to receive the signal holding duration T according to the cell identifier of the signal transmitting apparatuskeepSum signal duration threshold TthresholdPreviously, receiving indication cancellation according to cell identification of signal transmitting equipmentThe indication message is used for indicating whether the cell of the signal transmitting equipment supports the transmission delay sensitive service or not; when the indication message indicates that the cell of the signal transmitting apparatus supports the transmission delay sensitive service, or the indication message indicates that the cell of the signal transmitting apparatus does not support the transmission delay sensitive service, and the service supported by the user terminal is not the delay sensitive service, the first processing unit 102 is notified to execute the step of determining whether the cell of the signal transmitting apparatus can be accessed according to the signal holding time and the signal time threshold.
As shown in fig. 4, the signal transmitting apparatus may include: a communication unit 201 and a second processing unit 202. Wherein:
a communication unit 201, configured to send a synchronization signal to a user terminal through a used frequency band, where the synchronization signal carries an identifier of a signal transmitting device; and also for signalling the hold duration T to the user terminalkeepSum signal duration threshold TthresholdDuration of signal hold time TkeepSum signal duration threshold TthresholdThe method is used for a user terminal to determine whether a cell of a signal transmitting device covered by the signal transmitting device conforms to a cell access criterion of the signal transmitting device, wherein the cell access criterion of the signal transmitting device at least comprises the following conditions: t iskeep＞Tthreshold。
The communication unit 201 is further configured to send indication information to the user equipment, where the indication information is used to indicate whether the cell of the signal transmitting apparatus supports the transmission delay-sensitive service.
Before the communication unit 201 is further configured to send the indication information to the user terminal, the second processing unit 202 is configured to count a channel duty cycle according to historical usage information of a used frequency band, where the channel duty cycle is a ratio of time of preempting the used frequency band within a preset time period; the second processing unit 202 is further configured to determine an indication message according to the counted channel duty cycle and the time delay of the service supported by the user terminal for transmission, so as to send the indication message to the user terminal through the communication unit 201.
The second processing unit 202 is specifically configured to determine that the indication message is used to indicate the signal transmitting device to support transmission delay-sensitive service when it is determined that the access time interval corresponding to the channel duty cycle does not exceed the delay of the service supported by the user terminal for transmission; otherwise, determining that the indication message is used for indicating that the signal transmitting equipment does not support the transmission delay sensitive service.
Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of illustrating clearly the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A method for detecting and accessing signals of a multi-mode user terminal is characterized by comprising the following steps:
s1: a user terminal receives cell broadcast synchronization signals of signal transmitting equipment through a plurality of frequency bands to acquire cell identification information of the signal transmitting equipment;
s2: the user terminal receives the signal holding time length T according to the cell identification information of the signal transmitting equipmentkeepSum signal duration threshold Tthreshold；
S3: the user terminal keeps the duration T according to the signalkeepSum signal duration threshold TthresholdAnd determining whether the signal transmitting equipment can access and reside in the cell of the signal transmitting equipment.
2. The method as claimed in claim 1, wherein the signal hold time duration T is greater than the signal hold time duration TkeepOr signal duration threshold TthresholdAt least one of a master information block MIB message, a first new establishment message, a system information block SIB1 message or a SIB2 message carried in a Beacon signal, a broadcast message; wherein the first new message is sent before the SIB2 message.
3. The multimode user terminal signal detection and access method according to claim 1 or 2, further comprising, before said step S3:
the user terminal receives an indication message according to the cell identification information of the signal transmitting equipment, wherein the indication message is used for indicating whether the cell of the signal transmitting equipment supports the transmission delay sensitive service or not; and in case that the service supported by the ue is not a delay sensitive service, continuing to execute step S3.
4. The method as claimed in claim 3, wherein the indication message is carried in at least one of Beacon signal, MIB message or second new message.
5. The method as claimed in claim 4, wherein the MIB message includes an idle field and a system downlink bandwidth field; when the indication message is carried in the MIB message, the indication message is carried in an idle field in the MIB message; when the indication message is carried in the second new message, the second new message is sent before the SIB1 message.
6. A multimode user terminal signal detection and access method according to claim 3, characterized in that said indication message is determined by the channel duty cycle of the cell statistics of the signal transmitting device and the time delay of the service supported by the user terminal for transmission; the channel duty ratio refers to the ratio of the time length of the channel used by the signal transmitting equipment to the available time length of all channels in a preset time period; the value of the channel duty ratio on the authorized frequency band is defaulted to 1; the value is less than 1 in the unlicensed frequency band.
7. The method according to claim 6, wherein when the signal transmitting device determines that the access time interval corresponding to the channel duty cycle does not exceed the delay of the service supported by the user terminal for transmission, the signal transmitting device is determined to use the indication message to indicate that the signal transmitting device supports the transmission delay sensitive service; otherwise, determining that the indication message is used for indicating that the signal transmitting equipment does not support the transmission delay sensitive service.
8. The method as claimed in claim 1, wherein the cell access criteria of the signal transmitting device at least includes the following conditions: signal hold duration Tkeep> signal duration threshold Tthreshold。
9. The multimode user terminal signal detecting and accessing method according to claim 1, wherein the signal transmitting device is a base station of a cellular network operating in a licensed frequency band, or is an access point AP operating in a WLAN network operating in 2.4GHz and 5GHz unlicensed frequency bands, or is a device that transmits a beacon signal in a Zigbee, RFID, LoRa, IoT network operating in 230M, 470M, 700M, 1800MHz frequency bands.
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