CN110708759B - Narrow-band wireless link channel allocation method and centerless voice simulcasting method - Google Patents
Narrow-band wireless link channel allocation method and centerless voice simulcasting method Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L25/00—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00
- G10L25/48—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 specially adapted for particular use
- G10L25/51—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 specially adapted for particular use for comparison or discrimination
- G10L25/60—Speech or voice analysis techniques not restricted to a single one of groups G10L15/00 - G10L21/00 specially adapted for particular use for comparison or discrimination for measuring the quality of voice signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
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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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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a narrow-band wireless link channel allocation method and a centerless voice simulcasting method. The channel allocation method comprises the following steps: the link channels between the base stations adopt wireless channels with 25KHz frequency intervals, a frame is divided into four time slots on the wireless channels with 25KHz frequency intervals, and each base station is allocated with one time slot of the four time slots for receiving/transmitting data; the time slots allocated to any adjacent four base stations are different; taking any one base station, and if the last-stage base station of the base station uses a time slot 1, the next-stage base station of the base station uses a time slot 2; if the previous stage base station of the base station uses the time slot 2, the next stage base station of the base station uses the time slot 1; if the previous stage base station of the base station uses the time slot 3, the next stage base station of the base station uses the time slot 4; if the previous base station of the base station uses time slot 4, the next base station of the base station uses time slot 3. The invention improves the transmission rate of the narrow-band wireless link and has lower delay.
Description
Technical Field
The invention relates to the technical field of link channel allocation and voice simulcasting, in particular to a narrow-band wireless link channel allocation method and a centerless voice simulcasting method.
Background
To expand the coverage area, a narrowband communication system is typically composed of multiple base stations. These base stations locally transmit over narrowband wireless channels to serve mobile station communications. The base stations are networked to each other via various link technologies to serve the communication between the base stations. Common link technologies are divided into wireless and wired. Wireless multi-purpose microwave and other broadband transmission. By adopting broadband transmission, more voice data and control signaling data of multiple channels between base stations can be transmitted. But in some cases these wired and wireless links are not available. Temporary and rapid deployment is required in case of disaster emergency.
The link linking between base stations is carried out by using the same frequency channel of the narrow band communication system, and the method has practical use cases. However, the low rate of narrowband transmission causes longer delay, and the multi-hop method has the disadvantage of requiring more frequency points for eliminating interference.
In simulcast systems, signals transmitted by mobile stations may be received by multiple base stations. The common simulcast scheme is that each simulcast base station sends the received signals and field intensity data of the signals to a central station through a link for judgment and selection, and selects a better signal output according to the quality of each path of signals, and then sends the better signal output to a transmitter of each simulcast base station for synchronous transmission, so that the received voice of a received mobile station is ensured to be the same and clear. The above approach is not problematic when the link is broadband, as broadband links can guarantee the transmission of more content and within an acceptable delay. However, the use of the narrowband link may cause a large delay, which may be unacceptable to the user.
Disclosure of Invention
The invention mainly solves the technical problems of low transmission rate and longer time delay of the conventional narrowband wireless link, and provides a narrowband wireless link channel allocation method and a centerless voice simulcast method, which improve the transmission rate of the narrowband wireless link and have lower time delay.
The invention also solves the technical problem that the prior voice simulcasting method can cause larger time delay when being used in a narrow-band wireless link, and provides a narrow-band wireless link channel allocation method and a centerless voice simulcasting method, which have smaller time delay when being used in the narrow-band wireless link.
In order to solve the problems, the invention is realized by adopting the following technical scheme:
the invention relates to a method for distributing a narrow-band wireless link channel, which is formed by relay bidirectional linking of a plurality of base stations, and comprises the following steps:
the link channels between the base stations adopt wireless channels with 25KHz frequency intervals, a frame is divided into four time slots on the wireless channels with 25KHz frequency intervals, the four time slots are time slot 1, time slot 2, time slot 3 and time slot 4 in sequence, and each base station is allocated with one time slot of the four time slots for receiving/transmitting data;
in the narrow-band wireless link, the allocated time slots of any adjacent four base stations are different;
in the narrow-band wireless link, any base station is taken, and if the last-stage base station of the base station uses a time slot 1, the next-stage base station of the base station uses a time slot 2; if the previous stage base station of the base station uses the time slot 2, the next stage base station of the base station uses the time slot 1; if the previous stage base station of the base station uses the time slot 3, the next stage base station of the base station uses the time slot 4; if the previous base station of the base station uses time slot 4, the next base station of the base station uses time slot 3.
In the scheme, 1 frequency point is used for forwarding between the base stations, and a TDMA link relay bidirectional link with 25k channels and 4 time slots is adopted. For example: the narrowband wireless link is formed by relay bidirectional links of five base stations, wherein the five base stations are respectively a base station 1, a base station 2, a base station 3, a base station 4 and a base station 5 in sequence, the base station 1 uses a time slot 1, the base station 2 uses a time slot 3, the base station 3 uses a time slot 2, the base station 4 uses a time slot 4, the base station 5 uses a time slot 1, the channel allocation method of the invention is satisfied, the maximum delay of the narrowband wireless link is 165ms, and the average delay is 117ms. If the existing channel allocation method is adopted, the base station 1, the base station 2, the base station 3, the base station 4 and the base station 5 respectively use the time slot 1, the time slot 2, the time slot 3, the time slot 4 and the time slot 5, the maximum delay is 240ms, and the average delay is 150ms.
Preferably, the base station locally forwards the radio channel using a 12.5KHz frequency interval, dividing a frame into two time slots on the radio channel at the 12.5KHz frequency interval.
The base station uses 1 pair of frequency points for uplink and downlink in a TDMA access mode of 12.5KHz channels and two time slots. The base stations in the narrowband wireless link, the forward base station and the reverse base station adjacent to the link, continuously transmit in time slot 1 and time slot 2, or continuously transmit in time slot 3 and time slot 4, and are exactly aligned with time slot 1 or time slot 2 of the TDMA of 2 time slots of the local 12.5k bandwidth.
The invention relates to a centerless voice simulcast method, which is used for a narrow-band wireless link adopting the channel allocation method and comprises the following steps:
the voice data comprises voice header signaling positioned at the front end of the voice data, each base station in the narrow-band wireless link evaluates the signal quality of the voice data after receiving the local uplink voice data, marks the voice data as the voice data to be transmitted,
if a certain base station receives the same voice head signaling of voice data sent by a neighboring base station in a link as the voice head signaling of the voice data to be sent, comparing the signal quality of the voice data to be sent with the voice head signaling of the voice data to be sent, if the signal quality of the received voice data is not higher than the signal quality of the voice data to be sent, the base station sends the voice data to be sent to other base stations, if the signal quality of the received voice data is higher than the signal quality of the voice data to be sent, updating the voice data to be sent into the received voice data, and sending new voice data to be sent to other base stations;
and each base station in the narrow-band wireless link simultaneously transmits the voice data to be transmitted with the same voice header signaling in the local area when the preset delay time is reached.
According to the scheme, centerless voice judgment is adopted, voice data does not need to be sent to a central station for judgment, and the fact that better uplink voice is selected to be broadcast simultaneously in the shortest time is guaranteed. The centerless speech judgment refers to that each base station judges the speech signal quality in the link transmission, and judges and transmits the preferred signal under a shorter time delay. The narrowband wireless link used in the invention can only transmit a small amount of embedded signaling except the real-time continuous transmission voice data, and the equivalent rate of the embedded signaling is only about 200bits/s.
Preferably, the preset delay time is calculated according to the maximum link length of the narrowband wireless link and the link processing speed of the base station. The delay of the voice call is set at the longest delay from the beginning to the end of the link, which can ensure that the outgoing voice is not interrupted at the time of handoff of the voice source.
Preferably, each base station in the narrowband wireless link embeds signal quality data into the received local uplink voice data after evaluating the signal quality of the voice data.
The base station needs a long time for judging the quality of the digital voice signal, and the judging time of other base stations can be saved by embedding the signal quality data into the voice data.
Preferably, a hop count indication identifier of a four-bit field is embedded in each voice data, after receiving the local uplink voice data, each base station in the narrowband wireless link sets the value of the hop count indication identifier of the voice data to 0xf, the voice data with the value of the hop count indication identifier of 0xf is the source voice data, the source voice data is transmitted once in the narrowband wireless link, the value of the hop count indication identifier is subtracted by 1, when a certain base station receives the voice data with the same voice head and with the same signal quality, the base station compares the values of the hop count indication identifiers of the two voice data, and takes the voice data with the small value of the hop count indication identifier as the voice data to be transmitted to other base stations. For conflict resolution.
The beneficial effects of the invention are as follows: (1) The method improves the transmission rate of the narrow-band wireless link, has lower delay and uses fewer frequency points, and solves the defect that the prior channel allocation method needs more frequency points for eliminating interference when multi-hopping. (2) The voice simulcast has smaller time delay in the narrowband wireless link.
Drawings
FIG. 1 is a schematic diagram of a frame four-slot channel employed between base stations in a narrowband wireless link;
fig. 2 is a schematic diagram of a two-slot channel of a frame employed by local forwarding of a base station.
Detailed Description
The technical scheme of the invention is further specifically described below through examples and with reference to the accompanying drawings.
Examples: the method for allocating a narrowband wireless link channel in this embodiment includes that a narrowband wireless link is formed by relay bidirectional links of a plurality of base stations, and includes:
the link channels between the base stations adopt wireless channels with 25KHz frequency intervals, a frame is divided into four time slots on the wireless channels with 25KHz frequency intervals, the four time slots are time slot 1, time slot 2, time slot 3 and time slot 4 in sequence, and each base station is allocated with one time slot of the four time slots for receiving/transmitting data;
in the narrowband wireless link, the allocated time slots of any adjacent four base stations are different (the base stations which do not use the same time slot in the four base stations);
in the narrow-band wireless link, any base station is taken, and if the last-stage base station of the base station uses a time slot 1, the next-stage base station of the base station uses a time slot 2; if the previous stage base station of the base station uses the time slot 2, the next stage base station of the base station uses the time slot 1; if the previous stage base station of the base station uses the time slot 3, the next stage base station of the base station uses the time slot 4; if the previous base station of the base station uses time slot 4, the next base station of the base station uses time slot 3.
In the scheme, 1 frequency point is used for forwarding between the base stations, a TDMA link with 25k channels and 4 time slots is adopted for relay bidirectional link, and as shown in figure 1, the four time slots are time slot 1, time slot 2, time slot 3 and time slot 4 in sequence.
For example: the narrowband wireless link is formed by relay bidirectional links of five base stations, namely a base station 1, a base station 2, a base station 3, a base station 4 and a base station 5 in sequence.
The channel allocation method of the invention is adopted: base station 1 uses time slot 1, base station 2 uses time slot 3, base station 3 uses time slot 2, base station 4 uses time slot 4, base station 5 uses time slot 1, transmission delays are shown in table one,
list one
The existing channel allocation method is adopted: base station 1 uses time slot 1, base station 2 uses time slot 2, base station 3 uses time slot 3, base station 4 uses time slot 4, base station 5 uses time slot 1, transmission delay is as shown in table two,
watch II
From table one can see that the maximum delay of the radio link is 165ms and the average delay is 117ms. It can be seen from table two that the maximum delay of the radio link is 240ms and the average delay is 150ms. Therefore, the method of the invention improves the transmission rate of the narrow-band wireless link and has lower delay.
The base station locally forwards the wireless channel with a frequency interval of 12.5KHz, and divides a frame into two time slots on the wireless channel with the frequency interval of 12.5 KHz.
The base station uses 1 pair of frequency points for uplink and downlink in a TDMA access mode of a 12.5KHz channel and two time slots, and as shown in figure 2, the two time slots are time slot 1 and time slot 2 in sequence. The base station in the narrow-band wireless link adopting the method, the forward base station and the reverse base station which are adjacent to each other in the link are continuously transmitted in the time slot 1 and the time slot 2, or the time slot 3 and the time slot 4 are continuously transmitted and are exactly aligned with the time slot 1 or the time slot 2 of the TDMA of the 2 time slots of the local 12.5k bandwidth.
The centerless voice simulcast method of the present embodiment is used for a narrowband wireless link adopting the above-mentioned channel allocation method, and includes the following steps:
the voice data comprises voice header signaling positioned at the front end of the voice data, each base station in the narrow-band wireless link evaluates the signal quality of the voice data after receiving the local uplink voice data, marks the voice data as the voice data to be transmitted,
if a certain base station receives the same voice head signaling of voice data sent by a neighboring base station in a link as the voice head signaling of the voice data to be sent, comparing the signal quality of the voice data to be sent with the voice head signaling of the voice data to be sent, if the signal quality of the received voice data is not higher than the signal quality of the voice data to be sent, the base station sends the voice data to be sent to other base stations, if the signal quality of the received voice data is higher than the signal quality of the voice data to be sent, updating the voice data to be sent into the received voice data, and sending new voice data to be sent to other base stations;
and each base station in the narrow-band wireless link simultaneously transmits the voice data to be transmitted with the same voice header signaling in the local area when the preset delay time is reached.
According to the scheme, centerless voice judgment is adopted, voice data does not need to be sent to a central station for judgment, and the fact that better uplink voice is selected to be broadcast simultaneously in the shortest time is guaranteed. The centerless speech judgment refers to that each base station judges the speech signal quality in the link transmission, and judges and transmits the preferred signal under a shorter time delay. The narrowband wireless link used in the invention can only transmit a small amount of embedded signaling except the real-time continuous transmission voice data, and the equivalent rate of the embedded signaling is only about 200bits/s.
The preset delay time is calculated according to the maximum length of the link of the narrow-band wireless link and the link processing speed of the base station. The delay of the voice call is set at the longest delay from the beginning to the end of the link, which can ensure that the outgoing voice is not interrupted at the time of handoff of the voice source.
Each base station in the narrowband wireless link embeds signal quality data into received local uplink voice data after evaluating the signal quality of the voice data.
The base station needs a long time for judging the quality of the digital voice signal, and the judging time of other base stations can be saved by embedding the signal quality data into the voice data.
Each voice data is embedded with a four-bit field hop count indication mark, after each base station in the narrow-band wireless link receives the local uplink voice data, the value of the hop count indication mark of the voice data is set to 0xf, the voice data with the value of the hop count indication mark of 0xf is taken as source voice data, each time the source voice data is transmitted in the narrow-band wireless link, the value of the hop count indication mark is subtracted by 1, when a certain base station receives the voice data with the same voice head and consistent signal quality, the base station compares the values of the hop count indication marks of the two voice data, and the voice data with the small value of the hop count indication mark is taken as voice data to be transmitted and is transmitted to other base stations. For conflict resolution.
Claims (6)
1. The centerless voice simulcasting method is characterized by comprising the following steps:
the voice data comprises voice header signaling positioned at the front end of the voice data start, each base station in the narrow-band wireless link evaluates the signal quality of the voice data after receiving the local uplink voice data, marks the voice data as voice data to be transmitted, compares the signal quality of the voice data sent by the adjacent base station in the link with the signal quality of the voice header signaling of the voice data to be transmitted if the voice signaling of the voice data sent by the adjacent base station in the link is the same as the signal quality of the voice data to be transmitted, sends the voice data to be transmitted to other base stations if the signal quality of the received voice data is not higher than the signal quality of the voice data to be transmitted, and updates the voice data to be transmitted into the received voice data and sends new voice data to be transmitted to other base stations; narrowband wireless links can only transmit small amounts of embedded signaling.
2. The method of claim 1, wherein the preset delay time is calculated according to a maximum link length of the narrowband wireless link and a link processing speed of the base station.
3. A centreless voice simulcast method according to claim 1 or 2, wherein each base station in the narrowband wireless link embeds signal quality data in the received local uplink voice data after evaluating the signal quality of the voice data.
4. The method according to claim 1 or 2, wherein a hop count indication mark of a four-bit field is embedded in each voice data, each base station in the narrowband wireless link sets the value of the hop count indication mark of the voice data to 0xf after receiving the local uplink voice data, the voice data of the hop count indication mark of 0xf is the source voice data, each time the source voice data is transmitted in the narrowband wireless link, the value of the hop count indication mark is subtracted by 1, when a certain base station receives two voice data with the same voice head and consistent signal quality, the base station compares the values of the hop count indication marks of the two voice data, and uses the voice data of which the hop count indication mark has a small value as the voice data to be transmitted to other base stations.
5. A method for allocating channels of a narrowband wireless link, wherein the narrowband wireless link is formed by a plurality of base stations being linked in a relay bi-directional manner, and the method is used for any one of the centerless voice simulcast methods as claimed in claims 1-4, and is characterized by comprising the following steps:
a link channel between base stations adopts a wireless channel with a 25KHz frequency interval, a frame is divided into four time slots on the wireless channel with the 25KHz frequency interval, the four time slots are sequentially time slot 1, time slot 2, time slot 3 and time slot 4, each base station is allocated with one time slot of the four time slots for receiving/transmitting data, in a narrow-band wireless link, the time slots allocated by any adjacent four base stations are different, in the narrow-band wireless link, any base station is taken, if the last base station of the base station uses time slot 1, the next base station of the base station uses time slot 2, if the last base station of the base station uses time slot 2, the next base station of the base station uses time slot 1, if the last base station of the base station uses time slot 3, the next base station of the base station uses time slot 4, and if the last base station of the base station uses time slot 4.
6. The method of claim 5, wherein the base station locally forwards the radio channel using a 12.5KHz frequency interval, and divides a frame into two time slots on the radio channel using the 12.5KHz frequency interval; TDMA access mode of two time slots.
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