Branch : Computer Science and Engineering
Subject : Wireless Communication
Personal Communication Services/Networks (PCS/PCN)
Introduction:
The objective of personal communication systems (PCS) or personal communication networks (PCNs) is to provide ubiquitous wireless communications coverage, enabling users to access the telephone network for different types of communication needs, without regard for the location of the user or the location of the information being accessed.
PCS/PCN:
- The concept of PCS(PCN is based on an advanced intelligent network (AIN)
- In the PCS frequency spectrum the operator's authorized frequency block contains a definite number of channels
- The frequency plan assigns specific channels to specific cells, following a reuse pattern which restarts with each nth cell.
- The uplink and downlink bands are paired mirror images.
PCS Objectives:
- Convenience: It is very small, light portable phone with long usage times between battery charges
- Personal numbering: User has to dial a person, not a location.
- Call management: User can refuse or redirect calls; user hascontrol via caller Filtering
- Wired voice quality:PCS gives animproved wired voice quality over cellular
PCS Regulatory Characteristics (U.S.):
- 900 { 950 MHz and 1.850 { 2.200 GHz
- Broadband" and narrowband" services
- Several bands
- Licensed and unlicensed services
- Voice (isochronous) and data (asynchronous) services
Narrowband PCS
- NPCS can be used in 901-902, 930-931, 940- 941 MHz frequencies
- It is Licensed (auctioned summer '94) system
- Its Purpose is advanced messaging.
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Band allocations
- Two-way symmetrical: 50 KHz/50 KHz pairs
- Two-way asymmetrical: 50 KHz/12 KHz pairs
- One-way: 50 KHz
- Acknowledgment/talk-back for existing systems 12.5 KHz
Broadband PCS
- It is Operated in 1.850-2.200 GHz band
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Unlicensed version used in frequency band.
- Data: 1900-1910, 1910-1920 MHz
- Voice: 1890-1900, 1920-1930 MHz
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Licensed (pairs) version is used in given frequency band.
- 1850-1880 and 1930-1960 MHz
- 1880-1890 and 1960-1970 MHz
- 2130-2150 and 2180- 2200 MHz
- It is Auctioned late '94