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I read in the post that RPi 3 could not manage to operate on both bands simultaneously. Can RPi4 do that? We are planning to create mesh network with Rpi nodes. With single band operation, the throughput drops drastically, as the node count increases.

wifi

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edited 2 hours ago

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• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Devices with one radio only operate on one band at a time. Dual-band APs have two (or more) independent radios.
  
  – hobbs
  59 mins ago
  

  
  
  
  

add a comment
 | 

4

I read in the post that RPi 3 could not manage to operate on both bands simultaneously. Can RPi4 do that? We are planning to create mesh network with Rpi nodes. With single band operation, the throughput drops drastically, as the node count increases.

wifi

share|improve this question

edited 2 hours ago

tlfong01

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asked 10 hours ago

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• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Devices with one radio only operate on one band at a time. Dual-band APs have two (or more) independent radios.
  
  – hobbs
  59 mins ago
  

  
  
  
  

add a comment
 | 

I read in the post that RPi 3 could not manage to operate on both bands simultaneously. Can RPi4 do that? We are planning to create mesh network with Rpi nodes. With single band operation, the throughput drops drastically, as the node count increases.

wifi

share|improve this question

edited 2 hours ago

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edited 2 hours ago

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edited 2 hours ago

tlfong01

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edited 2 hours ago

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First to clarify: you are talking about RPi 3B, the link you have given is talking about a RPi 3B+. This is an important difference. RPi 3B only supports the 2.4 GHz band so there is no question if it can also use a 5 GHz band. It can't. RPi 3B+ supports dual band. The RPi 4B uses the same on-board wifi chip than RPi 3B+ so it also supports dual band.

With iw list on RPi 4B you will find:

valid interface combinations:

     * #{ managed } <= 1, #{ P2P-device } <= 1, #{ P2P-client, P2P-GO } <= 1,

       total <= 3, #channels <= 2

     * #{ managed } <= 1, #{ AP } <= 1, #{ P2P-client } <= 1, #{ P2P-device } <= 1,

       total <= 4, #channels <= 1

This tells you what combinations are possible. For example you can make in total 3 connections, maybe managed, P2P-client and P2P-GO on two channels (one on 2.4 GHz and one on 5 GHz). But with an access point (AP) you can have 4 connections in total but only on one channel.

If you do not find a possible combination you always can use an additional USB/WiFi dongle.

share|improve this answer

answered 8 hours ago

IngoIngo

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1

On the Raspberry Pi 4, wireless support is provided by the same Cypress CYW43455 chip as on the Pi 3 B+. A limitation of this chip is that it cannot do Real Simultaneous Dual Band (RSDB). You could add a USB wifi module, to have two devices, each on a different band.

share|improve this answer

edited 6 hours ago

answered 8 hours ago

Michael HarveyMichael Harvey

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0

There are very few production Wifi chips that supports concurrent dual band operation. The only one I know is SF16A18, which seems not to be in a real mass production phase.

This is because if you put dual band in a single chip that work concurrently, there will be signal interference problems since the TX/RX radio circuits are in like 2mm to each other on a single chip, and thermal problems thanks to the dual band power amplifier working concurrently, so it is hard to design.

For access points(or wireless routers) that supports concurrent dual band, often there are at least two Wifi chips on board, such as MT7620(single band 2.4G)+MT7612(dual band like the chip in the question, but works only under 5G).

So basically every dual band Wifi module in the market cannot support current dual band except for special designed modules which will be much larger and cost more.

share|improve this answer

answered 54 mins ago

jw_jw_

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3

First to clarify: you are talking about RPi 3B, the link you have given is talking about a RPi 3B+. This is an important difference. RPi 3B only supports the 2.4 GHz band so there is no question if it can also use a 5 GHz band. It can't. RPi 3B+ supports dual band. The RPi 4B uses the same on-board wifi chip than RPi 3B+ so it also supports dual band.

With iw list on RPi 4B you will find:

valid interface combinations:

     * #{ managed } <= 1, #{ P2P-device } <= 1, #{ P2P-client, P2P-GO } <= 1,

       total <= 3, #channels <= 2

     * #{ managed } <= 1, #{ AP } <= 1, #{ P2P-client } <= 1, #{ P2P-device } <= 1,

       total <= 4, #channels <= 1

This tells you what combinations are possible. For example you can make in total 3 connections, maybe managed, P2P-client and P2P-GO on two channels (one on 2.4 GHz and one on 5 GHz). But with an access point (AP) you can have 4 connections in total but only on one channel.

If you do not find a possible combination you always can use an additional USB/WiFi dongle.

share|improve this answer

answered 8 hours ago

IngoIngo

14.9k55 gold badges1919 silver badges7474 bronze badges

add a comment
 | 

3

First to clarify: you are talking about RPi 3B, the link you have given is talking about a RPi 3B+. This is an important difference. RPi 3B only supports the 2.4 GHz band so there is no question if it can also use a 5 GHz band. It can't. RPi 3B+ supports dual band. The RPi 4B uses the same on-board wifi chip than RPi 3B+ so it also supports dual band.

With iw list on RPi 4B you will find:

valid interface combinations:

     * #{ managed } <= 1, #{ P2P-device } <= 1, #{ P2P-client, P2P-GO } <= 1,

       total <= 3, #channels <= 2

     * #{ managed } <= 1, #{ AP } <= 1, #{ P2P-client } <= 1, #{ P2P-device } <= 1,

       total <= 4, #channels <= 1

This tells you what combinations are possible. For example you can make in total 3 connections, maybe managed, P2P-client and P2P-GO on two channels (one on 2.4 GHz and one on 5 GHz). But with an access point (AP) you can have 4 connections in total but only on one channel.

If you do not find a possible combination you always can use an additional USB/WiFi dongle.

share|improve this answer

answered 8 hours ago

IngoIngo

14.9k55 gold badges1919 silver badges7474 bronze badges

add a comment
 | 

First to clarify: you are talking about RPi 3B, the link you have given is talking about a RPi 3B+. This is an important difference. RPi 3B only supports the 2.4 GHz band so there is no question if it can also use a 5 GHz band. It can't. RPi 3B+ supports dual band. The RPi 4B uses the same on-board wifi chip than RPi 3B+ so it also supports dual band.

With iw list on RPi 4B you will find:

valid interface combinations:

     * #{ managed } <= 1, #{ P2P-device } <= 1, #{ P2P-client, P2P-GO } <= 1,

       total <= 3, #channels <= 2

     * #{ managed } <= 1, #{ AP } <= 1, #{ P2P-client } <= 1, #{ P2P-device } <= 1,

       total <= 4, #channels <= 1

This tells you what combinations are possible. For example you can make in total 3 connections, maybe managed, P2P-client and P2P-GO on two channels (one on 2.4 GHz and one on 5 GHz). But with an access point (AP) you can have 4 connections in total but only on one channel.

If you do not find a possible combination you always can use an additional USB/WiFi dongle.

share|improve this answer

answered 8 hours ago

IngoIngo

14.9k55 gold badges1919 silver badges7474 bronze badges

valid interface combinations:

     * #{ managed } <= 1, #{ P2P-device } <= 1, #{ P2P-client, P2P-GO } <= 1,

       total <= 3, #channels <= 2

     * #{ managed } <= 1, #{ AP } <= 1, #{ P2P-client } <= 1, #{ P2P-device } <= 1,

       total <= 4, #channels <= 1

share|improve this answer

answered 8 hours ago

IngoIngo

14.9k55 gold badges1919 silver badges7474 bronze badges

answered 8 hours ago

IngoIngo

14.9k55 gold badges1919 silver badges7474 bronze badges

answered 8 hours ago

IngoIngo

14.9k55 gold badges1919 silver badges7474 bronze badges

1

On the Raspberry Pi 4, wireless support is provided by the same Cypress CYW43455 chip as on the Pi 3 B+. A limitation of this chip is that it cannot do Real Simultaneous Dual Band (RSDB). You could add a USB wifi module, to have two devices, each on a different band.

share|improve this answer

edited 6 hours ago

answered 8 hours ago

Michael HarveyMichael Harvey

34811 silver badge99 bronze badges

add a comment
 | 

1

On the Raspberry Pi 4, wireless support is provided by the same Cypress CYW43455 chip as on the Pi 3 B+. A limitation of this chip is that it cannot do Real Simultaneous Dual Band (RSDB). You could add a USB wifi module, to have two devices, each on a different band.

share|improve this answer

edited 6 hours ago

answered 8 hours ago

Michael HarveyMichael Harvey

34811 silver badge99 bronze badges

add a comment
 | 

On the Raspberry Pi 4, wireless support is provided by the same Cypress CYW43455 chip as on the Pi 3 B+. A limitation of this chip is that it cannot do Real Simultaneous Dual Band (RSDB). You could add a USB wifi module, to have two devices, each on a different band.

share|improve this answer

edited 6 hours ago

answered 8 hours ago

Michael HarveyMichael Harvey

34811 silver badge99 bronze badges

share|improve this answer

edited 6 hours ago

answered 8 hours ago

Michael HarveyMichael Harvey

34811 silver badge99 bronze badges

answered 8 hours ago

Michael HarveyMichael Harvey

34811 silver badge99 bronze badges

answered 8 hours ago

Michael HarveyMichael Harvey

34811 silver badge99 bronze badges

0

There are very few production Wifi chips that supports concurrent dual band operation. The only one I know is SF16A18, which seems not to be in a real mass production phase.

This is because if you put dual band in a single chip that work concurrently, there will be signal interference problems since the TX/RX radio circuits are in like 2mm to each other on a single chip, and thermal problems thanks to the dual band power amplifier working concurrently, so it is hard to design.

For access points(or wireless routers) that supports concurrent dual band, often there are at least two Wifi chips on board, such as MT7620(single band 2.4G)+MT7612(dual band like the chip in the question, but works only under 5G).

So basically every dual band Wifi module in the market cannot support current dual band except for special designed modules which will be much larger and cost more.

share|improve this answer

answered 54 mins ago

jw_jw_

1

New contributor

jw_ is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment
 | 

0

There are very few production Wifi chips that supports concurrent dual band operation. The only one I know is SF16A18, which seems not to be in a real mass production phase.

This is because if you put dual band in a single chip that work concurrently, there will be signal interference problems since the TX/RX radio circuits are in like 2mm to each other on a single chip, and thermal problems thanks to the dual band power amplifier working concurrently, so it is hard to design.

For access points(or wireless routers) that supports concurrent dual band, often there are at least two Wifi chips on board, such as MT7620(single band 2.4G)+MT7612(dual band like the chip in the question, but works only under 5G).

So basically every dual band Wifi module in the market cannot support current dual band except for special designed modules which will be much larger and cost more.

share|improve this answer

answered 54 mins ago

jw_jw_

1

New contributor

jw_ is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment
 | 

There are very few production Wifi chips that supports concurrent dual band operation. The only one I know is SF16A18, which seems not to be in a real mass production phase.

This is because if you put dual band in a single chip that work concurrently, there will be signal interference problems since the TX/RX radio circuits are in like 2mm to each other on a single chip, and thermal problems thanks to the dual band power amplifier working concurrently, so it is hard to design.

For access points(or wireless routers) that supports concurrent dual band, often there are at least two Wifi chips on board, such as MT7620(single band 2.4G)+MT7612(dual band like the chip in the question, but works only under 5G).

So basically every dual band Wifi module in the market cannot support current dual band except for special designed modules which will be much larger and cost more.

share|improve this answer

answered 54 mins ago

jw_jw_

1

New contributor

jw_ is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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share|improve this answer

answered 54 mins ago

jw_jw_

1

New contributor

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Check out our Code of Conduct.

answered 54 mins ago

jw_jw_

1

New contributor

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answered 54 mins ago

jw_jw_

1